Boiling Point (Range) CAS No.: 64741-98-6; 64742-48-9; 64742-49-O; 64742-83-2; 68333-88-O; 68476-45-9; 68478-l O4; 68516-20-I; 68527-23-l; 68919-15-3 Robust Summary No.: OP E660 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Boiling Point

; 68333-88-O; 68476-45-9; 68478-10-4; 68516-20-I; 8527-23-l; 6891915-31

Test Conditions: Boiling Point is calculated by the MPBPWIN subroutine, which is based on the calculation method of S. Stein and R. Brown in

. Note: Concentration prep., “Estimation of Normal Boiling Points from Group Contributions”. vessel type, replication, test 1994. J. Chem. Inf. Comput. Sci. 34: 581-587. conditions.

Units/Value:

. Note: Deviations from substances represented by the 10 CAS numbers under Test protocol or guideline, Substance. Substances in this category do not have a specific analytical method. boiling point value. Actual boiling point ranges for substances in this category will vary dependent on their constituent composition. Commercial substances in this category consist of complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5-C12. The seven chemicals selected to represent the boiling point range of this category are C5-Cl1 hydrocarbons that can be found in substances identified by the 10 CAS numbers. Constituents representing category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured boiling point ranges for category substances, and olefinic process (distillation)

Page1 of3Boiling Point (Rang e) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E660 Results: (continued) Substance Calculated Measured* Constituent BP (°C) BP (°C) Units/Value: isopentane 30.18 27.8 Note: Deviations from protocol or toluene 125.72 110.6 guideline, analytical method. m -xylene styrene naphthalene tricyclodecane methylnaphthalene 148.29 139.1 146.65 145.0 231.64 217.9 171.25 na 249.60 241.1

* Experimental values from EPIWIN database.

na = not available The d ata represent a potential boiling point range for substances represented by the 10 CAS numbers under Test Substance

. Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extract, petroleum, heavy naphtha solven t 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylen e - manufacture - by - product 68478 - 10 -4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 H ydrocarbons, C6- 12, benzene - recovery Low Benzene Naphthas Category substances arise from production processes associated with ethylene manufacturing. The 10 CAS numbers are used to describe the nine process streams arising from the ethylene process and ot her associated manufacturing processes. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene c ontent is usually less than five percent. More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (1). 1. Olefins Panel, HPV Implementation Task Group. 2001. High Pro duction Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. Page 2 of 3Boiling Point (Rang e) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E660 Conclusion: The calculated boiling points for some representative constituents that are present in the category streams vary from 30.18 to 249.60°C @ 760 mm Hg. The measured boiling points of these same constituents vary from 27.8 to 241.1°C @ 760 mm Hg. Although this does not define the actual boiling points of the category st reams, it offers an indication of a range that might be expected to encompass the boiling points of these complex streams with variable compositions. Boiling points outside these ranges may be possible for some category streams. Reliability: (2) Reliablewith restrictions The results include calculated data based on chemical structure as modeled by EPIWIN and measured data for specific chemicals as cited in the EPIWIN database. The data represent a potential boiling point range for substances represented by the 10 CAS numbers listed under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents repres ent all substances defined by this category and as such, this robust summary represents a "key study" for boiling point range based on constituent data. Reference: EPIWIN. 1999. Estimation Program Interface for Windows, version 3.04. Syracuse Research Cor poration, Syracuse, NY, USA. (Boiling point values were calculated by the MPBPWIN subroutine and measured data came from the database in the computer program.) Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a se lection option under the Test Substance pick list that is in the IUCLID entry field for Boiling Point . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 3of 3Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Hydrolysis (Stability in Water) Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3] Method/Guideline: Other: Technic al discussion Year (guideline): Not applicable Type (test type): Not applicable GLP (Y/N): Not applicable Year (study performed): Not applicable Analytical Monitoring: Not applicable Test Conditions: Not applicable

• Note: Concentration preparation, vessel type, volu me, replication, deviations from guideline or protocol Results: Not applicable Units/Value: • Note: Analytical method, observations, half - lives by pH, degradation products Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extract, petroleum, heavy naphtha solvent 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C 9 - C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene manufacture - by - product 68478 - 10 - 4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery

Page 1 of 6Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 Low Benzene Naphthas Category substances arise from production processes associated with ethylene manufacturing. The 10 CAS numbers are used to descri be the nine process streams arising from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category ( 1). 1. Olefins Panel, HPV Implementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. Conclu sion: Summary In the environment, hydrolysis will not contribute to the degradation of constituent chemicals in the Low Benzene Naphthas Category. The Low Benzene Naphthas Category includes nine process streams: • Pyrolysis C7s Fraction • Pyrolysis C7 - C12 Frac tion • Pyrolysis C7 - C8 Fraction • C9+ From Xylene Unit • Hydrotreated C8 - C10 Fraction • Hydrotreated C7 - C12 Fraction • Hydrotreated C7+ Fraction • Hydrotreated C5/C9 blend • Toluene Extract Ten CAS numbers (see Test Substance) identify products derived from these proc ess streams. As discussed below, the chemicals in these streams are composed of carbon and hydrogen and are not amenable to hydrolysis because of their molecular structure and the chemical reaction required for this type of transformation to occur. The L ow Benzene Naphthas Category A process stream is a mixture of chemicals that arises from a chemical reaction or separation activity. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major c onstituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. This grouping of CAS numbers represents hydrocarbon streams with a carbon number distribution that is predominantly C5- C12. That is why this group is considered a category for purposes of the High Production Volume (HPV) Chemical Program, and designated Low Benzene Naphthas. Page 2of 6Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 The definitions found in the TSCA Chemical Substance Inventory for the CAS numbers included in th is group are vague with respect to composition. Therefore, it is possible to find that the same CAS number is correctly used to describe different streams (compositions) or that two or more different CAS numbers are used to describe the same stream (compos ition or process). More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (1). The plan is available on the U.S. Environmental Protection Agency website under the HPVChemical Program. A brief description of the production and composition of the nine process streams in this category are:

• Pyrolysis Fractions (C7s, C7 - C12, and C7 - C8 Fractions) are separated by distillation into various boiling- point range fractions as intermediates in preparation for further processing. Many carbon number distribution fractions are technically feasible. The compositions of these fractions vary depending on the ethylene process feedstock, the cracking furnaces operating conditions andthe ethylene process configuration.

1. Pyrolysis C7s Fraction has a carbon number distribution that is 75% toluene with the balance primarily C7 non aromatics, largely unsaturates. The stream may contain low levels of benzene. 2. Pyrolysis C7 - C12 Fraction has a typical composition including about 2% benzene, 23% toluene, 28% C8 aromatics and 8% naphthalene, with the balance expected to be largely unsaturated hydrocarbons and other aromatics. 3. Pyrolysis C7 - C8 Fraction has a carbon number distribution that is p redominantly C7 to C8. The reported compositions range from 45 to 80% with 11 to 78% C8 aromatics. The typical benzene concentration reported is 2% with a maximum of 5%.

• C9+ from Xylene Unit is a co- product from process units that produce o -or p -xylene . The carbon distribution for the stream is C8+ with some hydrocarbon compounds having a boiling point of 650°F or higher. The stream is predominantly aromatics.

• Hydrotreated Pyrolysis Fractions (C8 - C10, C7 - C12, C7+ Fractions, and C5/C9 Blend) are pyrol ysis gasoline or distillate fractions of pyrolysis gasoline that are treated with hydrogen over catalyst. The hydrogenation process may be either one - stage or two - stage. The one- stage process is typically a liquid - phase process where the primary objectiv e is to selectively convert diolefins to mono- olefins and to convert vinyl aromatics, for example, styrene to ethylbenzene. The second stage in a two stage hydrogenation process is typically a vapor - phase, more severe hydrogenation that converts essential ly all of the contained mono -and diolefins to paraffins. A pygas fraction that Page 3of 6Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 will be processed by extraction or extractive distillation to produce high purity aromatics (toluene or xylenes in this case) is subjected to two - stage hydrogenation. Pygas fractions may be forwarded to hydrodealkylation units (less common) for benzene production after one- stage of hydrogenation. Pygas fractions intended for use as a gasoline blending stock are frequently subject to only one - stage hydrogenation. The streams may result from fractionation of hydrotreated pyrolysis gasoline or from hydrotreating pyrolysis gasoline fractions followed by distillation. Reformate fractions from petroleum refineries are sometimes mixed with these pyrolysis fractions.

1. Hydrotreated C8- C10 Fraction has a carbon number distribution of C6 to C12, but is predominantly C8 to C10. Typical concentration includes 0.3% benzene, 2.4% toluene, 24% C8 aromatics with the balance primarily C9 and C10 aromatics and lesser amounts of paraffins, isop araffins and naphthenes in this carbon range. 2. Hydrotreated C7 - C12 Fraction is a distillate fraction of hydrogenated pygas with a carbon number distribution that is predominantly C7 - C12, with lesser amounts of C6. Typical reported values indicate 1% benzene, 23% toluene, 25% C8 aromatics, with the balance primarily other aromatics and lesser amounts of monoolefins and paraffins. 3. Hydrotreated C7+ Fraction is derived as distillation residue after removing the C5 and C6 fractions from a hydrogenated pygas st ream (alternately the stream could be hydrotreated after distillation). The carbon number distribution is predominantly greater than C6, although the reported analysis does not report compounds greater than C12. Typical reported values include 23% toluen e, 32% C8 aromatics, 1% naphthalene, with the balance primarily other aromatics and lesser amounts of paraffins. 4. Hydrotreated C5/C9 Blend is produced by blending C5 and C9 pyrolysis fractions, hydrogenated either before or after blending. Typical reporte d values includes approximately 2% benzene, 40% C5's in the blend, 9% C8 aromatics, 19% C9 aromatics, and 25% C10+.

• Toluene Extractis produced as a co- product of a benzene extraction unit. The stream may contain significant concentrations of xylenes.

Page 4of 6Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 Hydrolysis of Hydrocarbons as a Function of Molecular Structure with water (H2 nucleophilic substitution reaction, where X is the leaving group being replaced by the incoming nucleophilic oxygen from the water molecule. The leaving group, X, must be a molecule other than carbon because The carbon atom lacks sufficient electronegativity to be a good leaving alkenes, are not subject to hydrolysis (3) and this fate process will not contribute to the degradative loss of chemical components in this category from the environment. react with water by an addition reaction mechanism (2). The reaction product is an alcohol. This reaction is not considered to be hydrolysis reaction is freely reversible (3). Substances that have a potential to hydrolyze include alkyl halides, amides, carbamates, carboxylic acid esters and lactones, epoxides, phosphate esters, and sulfonic acid esters (4). olefins that contain at least one double bond (alkenes). The remaining chemicals are saturated hydrocarbons (alkanes). These two groups of chemicals contain only carbon and hydrogen. As such, their molecular Therefore, chemicals in the Low Benzene Naphthas Category have a very low potential to hydrolyze, and this degradative process will not contribute to their removal in the environment.

Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. Chemistry, Holt, Reinhart and Winston, New York, NY, USA. Lyman, W.F. Reehl, and D.H. Rosenblatt, eds., Handbook of Company, New York, NY, USA. CRC Press, Boca Raton, FL, USA. Hydrolysis of an organic molecule occurs when a molecule (R- X) reacts O) to form a new carbon - oxygen bond after the carbon - X bond is cleaved (2,3). Mechanistically, this rea ction is referred to as a for hydrolysis to occu r, the R- X bond cannot be a carbon- carbon bond. group and carbon - carbon bonds are too stable (high bond energy) to be cleaved by nucleophilic substitution. Thus, hydrocarbons, includi ng

Under strongly acidic conditions the carbon - carbon double bond found in alkenes , such as those in the Low Benzene Naphthas Category, will because the carbon - carbon linkage is not cleaved and bec ause the

The substances in the Low Benzene Naphthas Category are primarily

struct ure is not subject to the hydrolytic mechanism discussed above.

Referen ces

1. Olefins Panel, HPV Implementation Task Group. 2001. High

2. Goul d, E.S. (1959), Mechanism and Structure in Organic 3. Harris, J.C. (1982), "Rate of Hydrolysis," Chapter 7 in: W.J. Chemical Property Estima tion Methods, McGraw - Hill Book 4. Neely, W. B. 1985. Hydrolysis. In: W. B. Neely and G. E. Blau, eds. Environmental Exposure from Chemicals. Vol I., pp. 157 - 173.

Page 5of 6Hydrolysis (Stability in Water) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E667 Reliability: These data represent a key study for characterizing the potential of substances in the Low Benzene Naphthas Category to undergo hydrolysis. Reference: American Chemistry Council, Olefins Panel. 2003. Hydrolysis Low Benzene Naphthas Category. Rosslyn, VA, USA. Other (source) : American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selection option under the Test Substance pick list that is in the IUCLID entry field for Hydrolysis . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 6of 6Melting Point (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E661 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Melting Point Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculated values using MPBPWIN v ersion 1.40, a subroutine of the computer program EPIWIN version 3.04 Year (guideline): 1999 Type (test type): Not applicable GLP: Not applicable Year (study performed): Not applicable Test Conditions: Melting Point is calculated by the MPBPWIN subroutine, which is based on the average result of the methods of K. Joback and Gold • Note: Concentration prep., and Ogle. vessel type, replicati on, test conditions. Joback's Method is described in Joback, K.G. 1982. A Unified Approach to Physical Property Estim ation Using Multivariate Statistical Techniques. In The Properties of Gases and Liquids. Fourth Edition. 1987. R.C. Reid, J.M. Prausnitz and B.E. Poling, Eds. The Gold and Ogle Method simply uses the formula Tm = 0.5839Tb, where Tm is the melting point in Kelvin and Tb is the boiling point in Kelvin. The Gold and Ogle Method is described by Lyman, W.J., 1985, In: Environmental Exposure from Chemicals . Volume 1. Neely, W.B. and Blau, G.E. (eds), Boca Raton, FL, CRC Press, Inc., Chapter 2. Results: Calculated and measured melting point data for representative constituents of the Low Benzene Naphthas Category are listed Uni ts/Value: below. The data identify a potential melting point range f or

• Note: Deviations from protocol or guideline, analytical method. substances represented by the 10 CAS numbers under Test Substance . Substances in this category do not have a specific melting point value. Actual melting point ranges for substances in this category will vary dependent on their constituent composition

. Commercial substances in this category consist of complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5 - C12. The seven chemicals selected to represent the melting point range of this category are C5- C11 hydrocar bons that can be found in substances identified by the 10 CAS numbers. Constituents representing category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured boiling point ranges for catego ry substances, and olefinic process (distillation) knowledge. Page 1 of 3Melting Point (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E661 Results: (continued) Substance Calculated Measured* Constituent MP (°C) MP (°C) Units/Value: isopentane - 119.04 - 159.9 Note: Deviations from protocol or toluene - 59.17 - 94.9 guideline, analytical method. m -xylene styrene naphthalene tricyclodecane methylnaphthalene -40.69 -47.8

-48.31 - 31.0

5.01 80.2

- 19.15 na 22.15 34.4

* Experimental values from EPIWIN database.

na = not available The data represent a potential melting point range for su bstances represented by the 10 CAS numbers under Test Substance

. Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extract, petroleum, heavy naphtha solvent 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 -4 Naphtha, petrole um, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery Low Benzene Nap hthas Category substances arise from production processes associated with ethylene manufacturing. The 10 CAS numbers are used to describe the nine process streams arising from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. More info rmation on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (1). 1. Olefins Panel, HPV Implementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA.

Page 2 of 3Melting Point (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E661

Conclusion: The calculated melting points for some representative constituents that are present in the category streams vary from - 119.04 to 22.15 °C. The measured melting points of these same constituents vary from - 159.9 to 80.2°C. Although this does not define the actual melting points of the category streams, it offers an indication of a range that might be expected to encompass the melting points of these complex streams with variable compositions. Melting points outside these ranges may be possible for some category streams. Reliability: (2) Reliable with restrictions The results include calculated data based on chemic al structure as modeled by EPIWIN and measured data for specific chemicals as cited in the EPIWIN database. The data represent a potential melting point range for substances represented by the 10 CAS numbers listed under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robu st summary represents a "key study" for melting point range based on constituent data. Reference: EPIWIN. 1999. Estimation Program Interface for Windows, version 3.04. Syracuse Research Corporation, Syracuse, NY, USA. (Melting point values were calculated by the MPBPWIN subroutine and measured data came from the database in the computer program.) Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selection option under the Test Substance pick list that is in the IU CLID entry field for Melting Point . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 3of 3Partition Coefficient (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E663 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Partition Coefficient Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculated values using KOWWIN version 1.65, a subroutine of the computer program EPIWIN version 3.04 Year (guideline): 1999 Type (test type): Not applicable GLP: Not applicable Year (study performed): Not applicable Estimation Temperature: 25°C Test Conditions: Octanol / Water Partition Coefficient is calculated by the KOWWIN subroutine, which is based on an atom/fragment contribution • Note: Conce ntration prep., method of W. Meylan and P. Howard in "Atom/fragment vessel type, replication, test contribution method for estimating octanol - water partition conditions. coefficients". 1995. J. Pharm. Sci. 84:83 - 92. Results: Units/Value:

• Note: Deviations from protocol or guideline, analytical method. Calculated and measured log K ow data for representative constituents of the Low Benzene Naphthas Category are listed below. The data identify a potential log K ow range for substances represented by the 10 CAS numbers under Test Substance

. Substances in this category do not have a specific log K ow value. Actual log K ow ranges for subst ances in this category will vary dependent on their constituent composition. Commercial substances in this category consist of complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5 - C12. The seven chemicals select ed to represent the log K ow range of this category are C5- C11 hydrocarbons that can be found in substances identified by the 10 CAS numbers listed under Test Substance . Constituents representing category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured boiling point ranges for category substances, and olefinic process (distillation) knowledge.

Page 1 of 3Partition Coefficient (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E663 Results: (continued) Substance Calculated Measured* Constituent log Kow @ 25°C log Kow @ 25°C Units/Value: isopentane 2.72 na Note: Deviations from protocol or toluene 2.54 2.73 guideline, analytical me thod. m -xylene styrene naphthalene tricyclodecane methylnaphthalene 3.09 3.20 2.89 2.95 3.17 3.30 3.59 na 3.72 3.86

*Experimental values from E PIWIN database.

na = not available The data represent a potential log K ow range for substances represented by the 10 CAS numbers under Test Substance

. Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extrac t, petroleum, heavy naphtha solvent 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 - 45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 -4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light s team - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery Low Benzene Naphthas Category substances arise from production processes associated with ethylene manufacturing. The 10 CAS numbers are used to describe the nine process streams arisin g from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximatel y 45 to 95 percent. The benzene content is usually less than five percent. More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (1). 1. Olefins Panel, HPV Impleme ntation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA.

Page 2 of 3Partition Coefficient (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E663 Conclusion: The calculated log K ow for s ome representative constituents that are present in the category streams vary from 2.54 to 3.72 @ 25°C. The measured log K ow of these same constituents vary from 2.73 to 3.86 @ 25°C. Although this does not define the actual log K ow of the category stream s, it offers an indication of a range that might be expected to encompass the log K ow of these complex streams with variable compositions. Log K ow values outside these ranges may be possible for some category streams. Reliability: (2) Reliable with restr ictions The results include calculated data based on chemical structure as modeled by EPIWIN and measured data for specific chemicals as cited in the EPIWIN database. The data represent a potential log K ow range for substances represented by the 10 CAS num bers under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robust summary represents a "key study" for log Kow range based on constituent data. Reference: EPIWIN. 1999. Estimation Program Interface for Windows, version 3.04. Syracuse Research Corporation, Syracuse, NY, US A. (Log K ow values were calculated by the KOWWIN subroutine and measured data came from the database in the computer program.) Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selection option under the Test Subs tance pick list that is in the IUCLID entry field for Partition Coefficient . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 3of 3Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Photodegradation (Direct) Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3] Method/Guideline: Other: Technical di scussion Year (guideline): Not applicable GLP (Y/N): Not applicable Year (study performed): Not applicable Type (air, soil, water, other): Water Light Source: Not applicable Light Spectrum: Not applicable • Wave length value (upper/lower) Relative Int ensity: Not applicable Test Substance Spectrum: Not applicable Test Conditions: Not applicable • Note: Concentration, temperature, test system type, replication, deviations from guideline or protocol Direct Photolysis**: • Results: half - life, % degradation, quantum yield Summary In the environment, direct photolysis will not significantly contribute to the degradation of constituent chemicals in the Low Benzene Naphthas Category. The Low Benzene Naphthas Category includes nine process streams: • Pyrolysis C7s Fraction • Pyrolysis C7 - C12 Fraction • Pyrolysis C7 - C8 Fraction • C9+ From Xylene Unit • Hydrotreated C8 - C10 Fraction • Hydrotreated C7 - C12 Fraction • Hydrotreated C7+ Fraction • Hydrotreated C5/C9 blend • Toluene Extract Page 1 of 6Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668

these process streams. As discussed below, the reaction process involved in direct photolysis occurs when sufficient light energy excites a molecule to the degree that a structural transformation occurs. In chemicals that will undergo direct photolysis. The Low Benzene Naphthas Category A process stream is a mixture of chemicals that arises from a chemical reaction or separation activity. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. hydrocarbon streams with a carbon number distribution that is That is why this group is considered a category for purposes of the High Production Volume (HPV) Chemical the CAS numbers included in this group are vague with respect to composition. Therefore, it is possible to find that the same CAS number is correctly used to describe different streams (compositions ) or that two or more different CAS numbers are used to describe the same stream (composition or process). More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for Protection Agency website under the HPV Chemical Program. A brief description of the production and composition of the nine process streams in this category are:

• are as intermediates in preparation for further processing. Many carbon number distribution fractions are technically feasible. The process feedstock, the cracking furnaces operating conditions and the ethylene process configuration. 1. Pyrolysis C7s Fraction has a carbon number distribution The stream may contain low levels of benzene. 2. has a typical composition including about 2% benzene, 23% toluene, 28% C8 aromatics and 8% naphthalene, with the balance expected aromatics. Ten CAS numbers (see Test Substance) identify p roducts derived from general, substances in this category do not contain component

This grouping of CAS numbers represents predominantly C5- C12. Program, and designated Low Benzene Naphthas. The defin itions found in the TSCA Chemical Substance Inventory for

this category (1). The plan is available on the U.S. Environmental

Pyrolysis Fractions (C7s, C7 - C12, and C7 - C8 Fractions) separated by distillation into various boiling- point range fractions compositions of these fractions vary dep ending on the ethylene

that is 75% toluene with the balance primarily C7 non aromatics, largely u nsaturates. Pyrolysis C7 - C12 Fraction to be largely unsaturated hydrocarbons and other

Page 2of 6Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668

3. Pyrolysis C7 - C8 Fraction has a carbon number distribution that is predominantly C7 to C8. The reported compositions range from 45 to 80% with 11 to 78% C8 aromatics. The typical benzene concentration reported is 2% with a maximum of 5%.

• C9+ from Xylene Unit is a co- product from process units that produce o -or p -xylene. The carbon distribution for the stream is C8+ with some hydrocarbon compounds having a boiling point of 650°F or higher. The stream is predominantly aromatics.

• Hyd rotreated Pyrolysis Fractions (C8 - C10, C7 - C12, C7+ Fractions, and C5/C9 Blend) are pyrolysis gasoline or distillate fractions of pyrolysis gasoline that are treated with hydrogen over catalyst. The hydrogenation process may be either one - stage or two - stag e. The one- stage process is typically a liquid - phase process where the primary objective is to selectively convert diolefins to mono- olefins and to convert vinyl aromatics, for example, styrene to ethylbenzene. The second stage in a two stage hydrogenati on process is typically a vapor - phase, more severe hydrogenation that converts essentially all of the contained mono -and diolefins to paraffins. A pygas fraction that will be processed by extraction or extractive distillation to produce high purity aroma tics (toluene or xylenes in this case) is subjected to two - stage hydrogenation. Pygas fractions may be forwarded to hydrodealkylation units (less common) for benzene production after one- stage of hydrogenation. Pygas fractions intended for use as a gasol ine blending stock are frequently subject to only one - stage hydrogenation. The streams may result from fractionation of hydrotreated pyrolysis gasoline or from hydrotreating pyrolysis gasoline fractions followed by distillation. Reformate fractions from petroleum refineries are sometimes mixed with these pyrolysis fractions. 1. Hydrotreated C8 - C10 Fraction has a carbon number distribution of C6 to C12, but is predominantly C8 to C10. Typical concentration includes 0.3% benzene, 2.4% toluene, 24% C8 aromati cs with the balance primarily C9 and C10 aromatics and lesser amounts of paraffins, isoparaffins and naphthenes in this carbon range. 2. Hydrotreated C7 - C12 Fraction is a distillate fraction of hydrogenated pygas with a carbon number distribution that is pre dominantly C7 - C12, with lesser amounts of C6. Typical reported values indicate 1% benzene, 23% toluene, 25% C8 aromatics, with the balance primarily other aromatics and lesser amounts of monoolefins and paraffins. 3. Hydrotreated C7+ Fraction is derived as distillation residue after removing the C5 and C6 fractions from a hydrogenated pygas stream (alternately the stream could Page 3of 6Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668 be hydrotreated after distillation). The carbon number distribution is predominantly greater than C6, although the C12. Typical reported values include 23% toluene, 32% C8 aromatics, 1% naphthalene, with the balance primarily other aromatics and lesser amounts of paraffins. 4. Hydrotreated C5/C9 Blend is produced by blending C5 after blending. Typical reported values includes approximately 2% benzene, 40% C5's in the blend, 9% C8 aromatics, 19% C9 aromatics, and 25% C10+.

• Toluene Extract extraction unit. The stream may contain significant concentrations of xylenes. Photolysis of Hydrocarbons The direct photolysis of an organic molecule occurs when it absorbs sufficient light energy to result in a structural transformation (2). The reaction process is initiated when light energy in a specific wavelength range elevates a molecule to an electronically excited state. However, the excited state is competitive with various deactivation processes that nm, can result in the electronic excitation of an organic molecule. Light in this range contains energy of the same order of magnitude as infrared) result only in vibrational and rotational transitions, which do not tend to produce structural changes to a molecule. The stratospheric ozone layer prevents UV light of less than 290 nm between 290 and 750 nm can result in photochemical transformations excited molecule by mechanisms other than chemical transformation, resulting in no change to the parent molecule. rate is to assume that degradation will occur in proportion to the amount of light wavelengths >290 nm absorbed by the molecule (3). Saturated hydrocarbons do not absorb light above 200 nm. Some characteristic absorbance maxima ( l max e ) for selected unsaturated hydrocarbons are shown below (2): reported analysis does not report compounds greater than

an d C9 pyrolysis fractions, hydrogenated either before or

is produced as a co- product of a benzene

can result in the return of the molec ule to a non excited state. The absorption of light in the ultra violet (UV)- visible range, 110 - 750 covalent bond dis sociation energies (2). Higher wavelengths (e.g.

from reach ing the earth's surface. Therefore, only light at wavelengths in the environment (2). Although the absorption of UV light in the 290­ 750 nm range is necessary, it is not always sufficient f or a chemical to undergo photochemical degradation. Energy may be re- emitted from an A conservative approach to estimating a photochemical degradation ) and associated molar absorptivities (

Page 4of 6Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668

l below 290 nm l above 290 nm Hydrocarbon l max e l max e Ethylene 193 10,000 - - Benzene 255 215 - - Styrene 244 12,000 - - 282 450 Naphthalene 221 100,000 311 250 270 5,000 Olefins with one double bond, or two conjugated double bonds, which constitute the majority of the chemicals in the Low Benzene Naphthas category, do not absorb appreciable light energy above 290 nm. The absorption of UV light to cause cis -tra ns isomerism about the double bond of an olefin occurs only if it is in conjugation with an aromatic ring (2). Products in the Low Benzene Naphthas Category do not contain component molecules that will undergo direct photolysis. Therefore, this fate proces s will not contribute to a measurable degradative removal of chemical components in this category from the environment. References 1

. Olefins Panel, HPV Implementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan Fo r The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. 2. Harris, J. C. 1982. "Rate of Aqueous Photolysis," Chapter 8 in: W. J. Lyman, W. F. Reehl, and D. H. Rosenblatt, eds., Handbook of C hemical Property Estimation Methods, McGraw - Hill Book Company, New York, USA. 3

. Zepp, R. G. and D. M. Cline. 1977. Rates of Direct Photolysis in the Aqueous Environment, Environ. Sci. Technol., 11:359- 366. Indirect Photolysis**: Not applicable • Results: type of sensitiz er, concentration of sensitizer, rate constant, % degradation, half- life Degradation Products**: Unknown

• Note: Identification, concentration

Page 5of 6Photodegradation (Direct) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E668

Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extract, petroleum, heavy naphtha solvent 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbo ns, C5- 10 aromatic concentration, ethylene manufacture - by - product 68478 - 10 - 4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery Conclusion: Not applicable Reliability: These data represent a key study for characterizing the potential of substances in the Low Benzene Naphthas Category to undergo direct photodegradation. Reference: American Chemistry Council, Olefins Panel. 2003. Photodegradation (Direct): Low Benzene Naphthas Category. Rosslyn, VA, USA. Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selectio n option under the Test Substance pick list that is in the IUCLID entry field for Photodegradation (Direct) . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 6of 6Photodegrad ation (Indirect) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E670 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Photodegradation (Indirect)

Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculated valu es using AOPWIN version 1.89, a subroutine of the computer program EPIWIN version 3.04 Year (guideline): 1999 GLP (Y/N): Not applicable Year (study performed): Not applicable Type (air, soil, water, other): Not applicable Light Source: Sunlight LightSpectrum: • Wave length value (upper/lower) Natural sunlight Relative Intensity: 1 Test Substance Spectrum: Not applicable Test Conditions: • Note: Concentration, temperature, test system type, replication, deviations from guideline or protocol Indirect ph otodegradation, or atmospheric oxidation potential, is based on the structure- activity relationship methods developed by R. Atkinson. Temperature: 25°C Sensitizer: OH radical Concentration of Sensitizer: 1.5 E 6OH radicals/cm 3 Direct Photolysis**: Resul ts: half - life, % degradation, Not applicable quantum yield

Page 1 of 4Photodegrad ation (Indirect) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E670 Indirect Photolysis**: The Low Benzene Naphthas Category

• Results: type of sensitizer, Low Benzene Naphthas Category substanc es arise from concentration of sensitizer, production processes associated with ethylene manufacturing. rate constant, % degradation, The 10 CAS numbers are used to describe nine process streams half- life arising from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon prod uct streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. Commercial substances in this category consist of both high purity hydrocarbons and complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5 - C11. That is why this group is considered a category for purposes of the High Production Volume (HPV) Chemical Program, and designated Low Benzene Naphthas. The seven chemicals selected to represent the atmospheric oxidation potential of this category are C5 - C11 hydrocarbons that can be found in substances identified by the 10 CAS numbers. Constituents representin g category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured boiling point ranges for category substances, and olefinic process (distillation) knowledge. Atmospheric Oxidation of Hydrocarb ons In the environment, organic chemicals emitted into the troposphere are degraded by several important transformation processes. The dominant transformation process for most compounds is the daylight reaction with hydroxyl (OH - ) radicals (Atkinson, 1988, 1989). The rate at which an organic compound reacts with OH radicals is a direct measure of its atmospheric persistence (Meylan and Howard, 1993). AOPWIN estimates the rate constant for the atmospheric, gas phase reaction between photochemically produced hydroxyl radicals and organic chemicals. The rate constants estimated by the program are then used to calculate atmospheric half - lives for organic compounds based upon average atmospheric concentrations of hydroxyl radicals. Since the reactions only take place in the presence of sunlight, the atmospheric half - lives are normalized for a 12- hour day.

Page 2 of 4Photodegrad ation (Indirect) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E670 Indirect Photolysis**: (cont'd) Calculated* OH -Rate C onstant Chemical half - life (hrs) ( cm 3/molecule - sec) Results: type of sensitizer, concentration of sensitizer, rate isopentane 31.8 4.0 E - 12 constant, % degradation, half - life toluene m -xylene styrene naphthalene tricyclodecane methylnaphthalene 24.6 5.2 E - 12 9.5 13.6 E - 12 4.6 28.1 E - 12 5.9 21.6 E - 12 5.6 22.9 E - 12 2.3 56.5 E - 12

* Atmospheric half - lif e values are based on a 12 - hr day. More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (Olefins Panel, 2001).

References: 1. Atkinson, R. 1988. Estimation of gas - phase hydroxyl radical rate constants for organic chemicals. Environ. Toxicol. Chem

. 7 :435 - 442. 2. Atkinson, R. 1989. Kinetics and mechanisms of the gas phase reactions of the hydroxyl radical with organic compounds. J. Phys. Chem. Ref. Data Monograph No. 1, Amer. Inst. Physics & Amer. Chem. Soc., NY. 3. Meylan, W.M. and P.H. Howard. 1993. Computer estimation of the atmospheric gas - phase reaction rate of organic compounds with hydroxyl radicals and ozone. Chemosphere 12 :2293 - 2299. 4. Olefins Panel, HPV Imp lementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. Degradation Products**: Unknown

• Note: Identi fication, concentration

Page 3of 4Photodegrad ation (Indirect) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E670

Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: 64741 - 98 - 6 Extract, petroleum, heavy naphtha solvent 64742 -48 - 9 Naphtha, petroleum, hydrotreated heavy 64742 -49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 -4 Naphtha, petroleum, light steam - cracked, debezen ized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery Conclusion: Atmospheric oxidation via hydroxyl radicals can be a significant route of degradation for products in this category. Based on calculated values, products in this category can have an atmospheric half - life range of 2.3 to 31.8 hours as a result of indirect photolysis by hydroxyl radical at tack. Reliability: (2) Reliable with restrictions The results include calculated data based on chemical structure as modeled by AOPWIN. The data represent a potential atmospheric half - life range for substances represented by the 10 CAS numbers under Tes t Substance. This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robust summary represents a "key study" for atmospheric half - life range based on constituent data. Reference: Meylan, M., SRC 1994 - 1999. AOPWIN is contained in the computer program EPIWIN. 1999. Estimation Program Interface fo r Windows, version 3.04. Syracuse Research Corporation, Syracuse, NY, USA. Other (source): American Chemistry Council, Olefins Panel (Prepared 10/03) * Other TS is a selection option under the Test Substance pick list that is in the IUCLID entry field for Photodegradation (Indirect) . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

** In IUCLID, provide additional discussion if needed in the results freetext

Page 4 of 4Transport / Distribution (Fugacity) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68 516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E669 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Transport / Distribution (Fugacity) Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculate d according to Mackay Level I, EQC Model version 1.01 Year (guideline): 1997 Type (test type): Not applicable GLP: Not applicable Year (study performed): Not applicable Estimation Temperature: 25°C Test Conditions: The EQC Level I is a steady state, equilibrium model that utilizes the input of basic chemical properties including molecular weight, • Note: Concentration prep., vessel t ype, replication, test conditions. vapor pressure, and water solubility to calculate distribution within a standardized re gional environment. Physicochemical input values for the model were calculated using the EPIWIN Estimation v 3.04 program (1). Measured input values were also used where available and obtained from the EPIWIN database (1). Distribution data from the equi librium model provide basic information on the potential partitioning behavior of chemicals between selected environmental compartments (i.e., air, water, soil, sediment, suspended sediment, biota). 1. EPIWIN. 1999. Estimation Program Interface for Window s, version 3.04. Syracuse Research Corporation, Syracuse, NY, USA.

Page 1 of 4Transport / Distribution (Fugacity) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68 516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E669 Results: Units/Value:

• Note: Deviations from protocol or guideline, analytical method. Calculated partitioning data for representative constituents of the The data identify a potential distribution for substances represented by the . Actual distribution of substances in this category will vary dependent on their constituent composition. hydrocarbon reaction products with a carbon number distribution The seven chemicals selected to represent the environmental distribution range of this category are by the 10 CAS numbers. Constituents representing category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured (distillation) knowledge. The range of distribution data for constituent chemicals in each of the compartments can be used as an estimate of the partitioning behavior for category substances. representative constituents of substances in this category were determined using physicochemical input data calculated using the EPIWIN program: Calculated* Percent Distribution Chemical Air Water Soil Sediment isopentane 0.01 0.01 - toluene 98.17 1.40 0.43 - 97.19 1.33 1.45 0.03 styrene 95.55 2.61 1.80 0.04 naphthalene 24.47 32.28 42.28 0.94 tricyclodecane 98.68 0.29 1.01 0.02 methylnaphthalene 97.68 0.40 1.88 0.04 EPIWIN program Low Benzene Naphthas Category arelisted below. 10 CAS numbers under Test Substance

Commercial substances in this category consist of complex that is predominantly C5 - C12. C5 - C11 hydrocarbons tha t can be found in substances identified boiling point ranges for category subst ances, and olefinic process

The following Mackay Level I model distribution values for

99.98 m -xylene

* Distribution values determined using calcula ted input data from

Page 2 of 4Transport / Distribution (Fugacity) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68 516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E669 Results: (cont'd) Units/Value:

• Note: Deviations from protocol or guideline, analytical method. Measured** Percent Distribution Chemical Air Water Soil Sediment Isopentane 99.98 0.01 0.01 - toluene 98.80 0.81 0.39 - 97.91 0.86 1.20 0.03 styrene 96.65 1.85 1.46 0.04 naphthalene 42.27 20.56 36.33 0.81 tricyclodecane na na na na methylnaphthalene 98.53 0.19 1.25 0.03 ** Distribution values determined using measured input data from na = not available

Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: Extract, petroleum, heavy naphtha solvent Naphtha, petroleum, hydrotreated heavy

production processes associated with ethylene manufacturing. The 10 CAS numbers are used to describe the nine process streams arising from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. found in the American Chemistry Council, Olefins Panel test plan for this category (1). 1. Olefins Panel, HPV Implementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. m -xylene

the EPIWIN program experiment al database.

64741 - 98 - 6 64742 -48 - 9 64742 - 49 - 0 Naphtha, petroleum, hydrotreated light 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 - 4 Naphtha, petroleum, light steam - cracked, debezen ized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery Low Benzene Naphthas Category substances arise from

product s treams associated with the ethylene industry.

More information on the Low Benzene Napht has Category can be

Plan For The Low Benzene Naphth as Category.

Page 3of 4Transport / Distribution (Fugacity) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68 516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E669 Conclusion: The partitioning data represent a potential distribution range for substances in the 10 CAS numbers listed under Test Substance

. Substances in the Low Benzene Naphthas Category are calculated to partition primarily to air with a negligible percentage partitioning to water, soil, and sediment. Relatively high vapor pressure and high water solubility largely control the partitioning behavior of const ituent chemicals in substances from this category. The input data used to run the EQC Level I model included estimated values calculated by the EPIWIN program based on chemical structure and measured data from the EPIWIN database. A comparison of the distribution data developed using either all calculated input values or measured values where data were available indicate a similar partitioning behavior and support the use of the dataset for chemicals without any measured data. Reliability: (2) Reliable wi th restrictions The input data used to run the EQC Level I model include calculated and experimental values available through the EPIWIN program. The data represent a potential environmental distribution range for substances with the 10 CAS numbers listed under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robust summary represents a "key study" for distribution range based on constituent data. Reference: Mackay, D.A. DiGuardo, S. Paterson, and C. Cowan. EQC Model Version 1.01. 1997. Available from the Environmental Mode ling Centre, Trent University, Canada. Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selection option under the Test Substance pick list that is in the IUCLID entry field for Transport - Distribution . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 4 of 4Vapor Pressure (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E662 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Vapor Pressure Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculated values using MPBPWI N version 1.40, a subroutine of the computer program EPIWIN version 3.04 Year (guideline): 1999 Type (test type): Not applicable GLP: Not applicable Year (study performed): Not applicable Estimation Temperature: 25°C Test Conditions:

• Note: Concentration prep., vessel type, replication, test conditions. Vapor Pressure is calculated by the MPBPWIN subroutine, which is based on the average result of the methods of Antoine and Grain. Both methods use boiling point for the calculation. The Antoine Method is described in the Handbook of Chemical Property Estimation. Chapter 14. W.J. Lyman, W.F. Reehl and D.H. Rosenblatt, Eds. Washington, D.C.: American Chemical Society. 1990. A modified Grain Method is described on page 31 of Neely and Blau's Environmental Exposure from Chemicals , Volume 1, CRC Press. 1985. Results: Calculated and measured vapor pressure data for representative constituents of the Low Benzene Naphthas Category are listed Units/Value: below. The data identify a potential vapor pressure range for

• Note: Deviations from protocol or guideline, analytical method. substances represented by the 10 CAS numbers under Test Substance . Substances in this category do not have a specific vapor pressure value. Actual vapor pressure ranges for substances in this category will vary dependent on their constituent composition. Commercial substances in this category consist of complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5 - C12. The seven chemicals selected to represent the vapor pressure range of this category are C5 - C11 hydrocarbons that can be found in substances identified by the 10 CAS numbers. Constituents representing category members were selected on the basis of carbon number as identified by the categ ory name, chemistry/structure, measured boiling point ranges for category substances, and olefinic process (distillation) knowledge.

Page 1 of 3Vapor Pressure (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E662 Results (continued): Units/Value: Note: Deviations from protocol or guideline, analytical method. Substance Calculated VP Measured* VP Constituent (hPa @ 25°C) (hPa @ 25°C) isopentane 9.17 E2 9.19 E2 toluene 31.60 37.86 8.83 11.05 styrene 6.73 8.53 naphthalene 0.11 0.05 tricyclodecane 2.64 na methylnaphthalene

na = not available The data represent a potential vapor pressure range for Substance

. Test Substance: The Low Benzene Naphthas Category includes the following CAS numbers: Naphtha, petroleum, hydrotreated heavy Naphtha, petroleum, hydrotreated light

Low Benzene Naphthas Category substances arise from production processes associated with ethylene manufacturing. The 10 CAS numbers are used to describe the nine process manufacturing processes. The category includes hydrocarbon product streams associated with the ethylene industry. Aromatics represent the major constituents in all of the streams, varying from The benzene content is usually less than five percent. More information on the Low Benzene Naphthas Category can be found in the American Chemistry Council, Olefins Panel test plan for this category (1). 1. Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Chemistry Council, Olefins Panel, HPV Implementation Task Group. VA, USA. m -xylene

4.60 E - 2 7.33 E - 2 * Experimental values from EPIWIN da tabase. substances represented by the 10 CAS numbers under Test

64741 - 98 - 6 Extract , petroleum, heavy naphtha solvent 64742 -48 - 9 64742 -49 - 0 64742 - 83 - 2 Naphtha, petroleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 1 0 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 - 4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light st eam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery

streams arising from the ethylene process and other associated approximately45 to 95 percent.

Olefins Panel, HPV Implemen tation Task Group. 2001. High

Page 2 of 3Vapor Pressure (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E662 Conclusion: The calculated vapor pressure s for some representative constituents that are present in the category streams vary from 4.60 E - 2 to 9.17 E2 hPa @ 25°C. The measured vapor pressures of these same constituents vary from 7.33 E - 2 to 9.19 E2 hPa @ 25°C. Although this does not define the actual vapor pressures of the category streams, it offers an indication of a range that might be expected to encompass the vapor pressures of these complex streams with variable compositions. Vapor pressure outside these ranges may be possible for some ca tegory streams. Reliability: (2) Reliable with restrictions The results include calculated data based on chemical structure as modeled by EPIWIN and measured data for specific chemicals as cited in the EPIWIN database. The data represent a potential vapor pressure range for substances represented by the 10 CAS numbers under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robust summary represents a "key study" for vapor pressure range based on constituent data. Reference: EPIWIN. 1999. Estimation Program Interface for Win dows, version 3.04. Syracuse Research Corporation, Syracuse, NY, USA. (Vapor pressure values were calculated by the MPBPWIN subroutine and measured data came from the database in the computer program.) Other (source): American Chemistry Council, Olefins P anel (Prepared 7/03) * Other TS is a selection option under the Test Substance pick list that is in the IUCLID entry field for Vapor Pressure . Selecting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

Page 3of 3Water Solubility (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E664 

### LOW BENZENE NAPHTHAS ROBUST SUMMARY Water Solubility Test Substance*: Other TS [CAS # 64741 - 98 - 6; 64742-48 - 9; 64742 -49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476-45 - 9; 68478 - 10 -4; 68516- 20 - 1; 68527 - 23 - 1; 68919- 15 - 3] Method/Guideline: Calculated values using WSKO WWIN version 1.36, a subroutine of the computer program EPIWIN version 3.04 Year (guideline): 1999 Type (test type): Not applicable GLP: Not applicable Year (study performed): Not applicable Estimation Temperature: 25°C Test Conditions: Water Solubility is calculated by the WSKOWWIN subroutine, which is based on a Kow correlation method described by W. • Note: Concent ration prep., Meylan, P. Howard and R. Boethling in "Improved method for vessel type, replication, test estimating water solubility from octanol/water partition coefficient". conditions. Environ. Toxicol. Chem . 15:100 - 106. 1995. Results: Units/Value:

• Note: Deviations from protocol or guideline, analytical method. Calculated and measured water solubility data for representative constituents of the Low Benzene Naphthas Category are listed below. The data identify a potential water solubility range for substances represented by the 10 CAS numbers under Test Substance . Substances in this category do not have a specific water solubility value. Actual water solubility ranges for substances in this category will vary dependent on their loading rate (i.e., weight of test material added to a volume of water). Commercial substances in this category consist of complex hydrocarbon reaction products with a carbon number distribution that is predominantly C5 - C12. The seven chemicals selected to represent the water solubility range of this category are C5- C11 hydrocarbons that can be found in substances identified by the 10 CAS numbers. Constituents re presenting category members were selected on the basis of carbon number as identified by the category name, chemistry/structure, measured boiling point ranges for category substances, and olefinic process (distillation) knowledge.

Page 1 of 3Water Solubility (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E664 Results: (continued) Units/Value: Note: Deviations from protocol or guideline, analytical method. Substance Calculated WS Measured WS* Constituent ( mg/L @ 25°C) (mg/L @ 25°C) isopentane 184.6 na toluene 832.7 573.1 258.4 207.2 styrene 386.7 343.7 naphthalene 183.8 142.1 tricyclodecane 21.5 na methylnaphthalene 54.6 41.4 * Experimental values from EPIWIN database.

na = not available The data represent a potential water solubility range for Substance

. The Low Benzene Naphthas Category includes the following CAS numbers: Extract, petroleum, heavy naphtha solvent Naphtha, petroleum, hydrotreated heavy Naphtha, petroleum, hydrotreated light

Low Benzene Naphthas Category substances arise from The 10 CAS numbers are used to describe the nine process streams arising from the ethylene process and other associated manufacturing processes. The category includes hydrocarbon Aromatics represent the major constituents in all of the streams, varying from approximately 45 to 95 percent. The benzene content is usually less than five percent. More information on the Low Benzene Naphthas Category can be for this category (1). 1. Olefins Panel, HPV Implementation Task Group. 2001. High Production Volume (HPV) Chemical Challenge Program Test Plan For The Low Benzene Naphthas Category. American Group. VA, USA. m -xylene

substances represented by the 10 CAS numbers under Test

Test Su bstance: 64741 - 98 - 6 64742 -48 - 9 64742 -49 - 0 64742 - 83 - 2 Naphtha, petr oleum, light steam - cracked 68333 - 88 - 0 Aromatic hydrocarbons, C9- C17 68476 -45 - 9 Hydrocarbons, C5- 10 aromatic concentration, ethylene - manufacture - by - product 68478 - 10 - 4 Naphtha, petroleum, light steam - cracked, debezenized, C8 - 16 - cycloalkadiene concentrate 68516 - 20 - 1 Naphtha, petroleum, steam - cracked middle aromatic 68527 - 23 - 1 Naphtha, petroleum, light steam - cracked aromatic 68919 - 15 - 3 Hydrocarbons, C6- 12, benzene - recovery production processes associated with ethylene manufacturing. product streams associated with the ethylene indust ry.

found in the American Chemistry Council, Olefins Panel test plan

Chemistry Council, Olefins Panel, HPV Implementation Task

Page 2 of 3Water Solubility (Range) CAS No.: 64741 - 98 - 6; 64742 - 48 - 9; 64742- 49 - 0; 64742- 83 - 2; 68333 - 88 - 0; 68476- 45 - 9; 68478 - 10 - 4; 68516 - 20 - 1; 68527- 23 - 1; 68919 - 15 - 3 Robust Summary No.: OP E664 Conclusion: The calculated water solubility for some representative constituents that are present in the category streams vary from 21.5 to 832.7 mg/L @ 25°C. The measured water solubility of these s ame constituents vary from 41.4 to 573.1 mg/L @ 25°C. Although this does not define the actual water solubility of the category streams, it offers an indication of a range that might be expected to encompass the water solubility of these complex streams with variable compositions. Water solubilities outside these ranges may be possible for some category streams. Reliability: (2) Reliable with restrictions The results include calculated data based on chemical structure as modeled by EPIWIN and measured da ta for specific chemicals as cited in the EPIWIN database. The data represent a potential water solubility range for substances represented by the 10 CAS numbers under Test Substance . This robust summary has a reliability rating of 2 because the data are not for specific substances in the Low Benzene Naphthas Category, but rather for selected constituents. These selected constituents represent all substances defined by this category and as such, this robust summary represents a "key study" for water solubi lity range based on constituent data. Reference: EPIWIN. 1999. Estimation Program Interface for Windows, version 3.04. Syracuse Research Corporation, Syracuse, NY, USA. (Water solubility values were calculated by the WSKOWWIN subroutine and measured data came from the database in the computer program.) Other (source): American Chemistry Council, Olefins Panel (Prepared 7/03) * Other TS is a selection option under the Test Substance pick list that is in the IUCLID entry field for Water Solubility . Selec ting this option refers the reader to information in the test substance "freetext" field to which the CAS numbers can be added.

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