TOXIC SUBSTANCES CONTROL ACT (TSCA) 

PL 94- 469 

CANDIDATE LIST OF 

CHENICAL SUBSTAJ.~CES 

ADDENDUM III 

Chemical Substances of Unknown or Variable Compositi on , 

Complex Reaction Products and Biological Materials 

Narch 1978 

U. S. Environmental Protection Agency 

Office of Toxic Substances 

Washington, DC 20460 
Intr oduction • 

Section I 

Section II 

Section III 

Section IV 

Section \1 

Section VI 

TABLE OF ~ONTENTS 

Class 2 Chemical Substances Derived from 

Natural Fats and Oils and Synthet ic Substitutes (An Alternate Procedure for Substance Identification and Reporting for 

the Chemical Substance Invertory) 

Coke and Selected Coal Chemicals 

Chemical Subst ances Common to t he I r on 

and Steel Industry 

Wood and Pulp Chemicals 

Chemical Substances Manufactured in the 

Paper Industry . . . . . . . . 

Chemical Subst ances Manufactur ed i n the 

Fertilizer I ndustry 

Section VII : Natural Oils and Extractives 

Section VIII: Selected Polymers . 

Section IX Chemical Substances Manufactured as 

Part of Mixtures 

" 

Section X Other Class 2 Chemical Substances 

i 

1 

3 

35 

39 

43 

47 

49 

51 

63 

77 

81 
INTRODUCTION 

The Toxic Substances Control Act (TSCA), Public La\~ 94- 469 , requires the U.S. Environmental Protection Agency to compile, keep current, and publish a list of each chemical substance which is manufactured, imported, or processed in the United States for commercial 

purposes. Under the authority of Section 8 of TSCA , EPA will compile 

this inventory from reports prepared and submitted by manufac turers, 

importers, and processors of chemical substances in accordance with 

Inventory Reporting Regulations (40 CFR 7-10) . These regulations were 

published in the FEDERAL REGISTER on December 23, 1977 (pages 64572 to 

64596), and became effective on January 1, 1978. 

In April 1977, EPA published the TSCA Candidate List of Chemical 

Substances, which identifies over 30,000 chemical substances. The 

Candidate List was prepared to assist persons in reporting chemical 

substances for the Inventory . In January 1978, EPA published two 

addenda to the Candidate List, the first identifying petroleum refinery 

intermediate and final process stream chemical substances, and the 

second identifying an additional 3,000 Class 1 chemical substances. A 

Class 1 chemical substance is one whose composition can be represented 

by a definite chemical structure diagram . 

This document, addendum III to the Candidate List , identifies 

primarily Class 2 chemical substances, and provides a mechanism for 

identifying and reporting others. A Class 2 chemical substance is one 

whose composition cannot be represented by a definite chemical structure 

diagram. Some chemical substances identified in this addendum are 

defined, in part, in terms of the processes by which they are manufac - 1 

tured . Other chemical substanEes are simply identified by names which . 

are widely recognized and need no further definition . 

Certain common materials of commerce, such as inorganic glasses , 

are defined by the Inventory Reporting Regulations as mixtures . To 

facilitate reporting , this addendum defines certain categories which 1 

encompass the individual che~ical substances manufactured in the production of these mixtures. 

This addendum is organized into ten ~Pctions , listing terms developed by [PA in cooperation with various trade associations and other 

agents. They represent industries involved in the manufacture of Class 

2 chemical substances which are difficult to define, either due to 

slight variations of process or because the composition of these substances is not completely kno'~ or is variable . Although this addendum 

identifies chemical substances which are common to specific industr ies, 

it does not include all reportable chemical substances manufactured 

within these industries. Furthermore, ~ persons who manufacture such 

substances may use the nomenclature presented in this addendum to report 

for the Inventory if this nomenclature accurately describes the chemical 

substances they manufacture. 
l 

All chemical substances identified in this addendum, with the excep tion of those in Section I (multi- component Class 2 substances derived 

from natural fats and oils or synthetic substitut es) , are listed with 

CAS Registry Numbers and EPA Code Designations, and may be reported on 

Form A. The substances identified in Section I must be reported on Form 

C according to the procedures outlined in that section. 

2 
General 

Section I 

CLASS 2 CHEHICAL SUBSTANCES DERIVED FROM NATURAL 

FATS AND OILS fu~D SYNTHETIC SUBSTITUTES 

An Alternate Procedure for Substance 

Identification and Reporting 

for the Chemical Subst anc e Inventory 

This sec tion presents an alternate and relatively simple procedure 

for identifying and reporting certain multicomponent Class 2 chemical 

substances derived from natural fats and oils and synthetic long- chain 

alkyl substitutes. The procedure was developed by The Soap and Detergent 

Association in conjunction with the EPA and is intended to standardize 

the identification of substances manufactured and used extensively in 

the soap and detergent industry. This standardization should provide 

for easier and more certain reporting and recording of information for 

these substances. Accordingly, the procedure may be used to report 

multicomponent soaps and surface active agents (and also their precursors and derivatives) manufactured , imported, or processed for such uses 

as wetting agents, emulsifiers, dispersants, and penetrants. Its applicability , however, should extend beyond the soap and deter gent industry. 

This procedure may not be used to report any single component Class 

1 chemical substance (i.e., a substance whose composition may be represented by a definite chemical structure diagram) or any combination of 

such substances prepared by mixing '~itho ut chemical reaction . Furthermore , it should not be used in those cases where the person reporting 

considers its applicability to be marginal or in ques tion . I nstead, the 

conventional procedures should b~ followed for chemical substance identif i ca tion and reporting, as specified in the EPA publication "Reporting 

for the Chemical Substance I nventory" (December 1977). 

The Class 2 chemical substances which may be r eported following 

procedures specified here are c~mplex, multicomponent materials whose 

individual componen ts have a common structural fea ture : one or more 

long- chain alkyl groups to which is attached a l1 emically functional 

group or groups. These components differ from one ano ther with respect 

to one or more of the following long-chain alkyl group char acteristics: 

length (carbon number), saturation, structure (linear or branched), 

and/or the position of functional group attachment (s) . 

Be fore 1950 , most of these substances were derived commercially 

from natural sour ces. However , synthetically-derived sources of similar 

composition have since been developed and are presently used interchangeably with natural sources. 

3 
Substance Identification 

According to procedures specified in this section, certain of these 

Class 2 chemical substances may be identified by systematically-derived, 

chemically- descriptive SDA Substance Names . The proper SDA Substance 

Name for each is that which most precisely describes the chemical composition of the substance. Each substance is reported on Inventory 

Report Form C and identified only by the SDA Substance Name and special 

SDA Reporting Number, and not in terms of source , blend, process, or 

reaction information. During form processing, each substance reported 

follo~ving this procedure will be assigned a CAS Registry Number which 

~•ill appear on the Inventory with the SDA Substance Name and Reporting 

Number and with substance synonyms , if reported. 

SDA Substance Names consist of two or , in some cases, three parts. 

The two parts common to all SDA Substance Names are: (1) the Alkyl 

Descriptor , A, \vhich describes the long-chain alkyl groups of the 

substance, and (2) the Functionality Descriptor, F, which identifies the 

functional group(s) of the substance . A third part, the Salt Descriptor, S, identifies the cation(s) of any salt. 

SDA Substance Names are systematically constructed according to the 

following formats : 

(A) alkyl (F), 

or in the case of salts, 

(A) alkyl (F)(S), 

where A denotes the Alkyl Descriptor; F , the Functionality Descriptor; and S, the Salt Descriptor. 

For example, the SDA Substance Name for a fatty amine \vhich contains 

predominantly cl0- cl6 saturated alkyl chain- lengths is: 

cl0- cl6 alkyl amine 

·' 

where the phrase "c10-c16" corresponds to the Alkyl 

Descriptor (A), and am1ne", to the Functi onality 

Descriptor (F). 

Similarly, the SDA Substance Name for the sodium salt of a fatty carboxylic acid comprised predominantly of cl8 sa turated and cl8 unsaturated alkyl chains is : 

c

18 and c18 unsaturated alkyl carboxylic acid sodium salt 

~•here the phrase "c

18 and c18 unsaturated " corresponds to 

the Alkyl Descriptor (A); "carboxylic acid ", to the 

Functionality Descriptor (F); and "sodium salt", to the 

Salt Descriptor (S) . 

4 
The Class 2 chemical substances covered by this section are limited 

to those ~vhose composition may be described using the Alkyl, Functionality , and Salt Descriptors listed in Tables 1, 2, and 3, respectively . 

These descriptors, discussed in detail below , may be combined in the SDA 

Substance Name format to describe more than 5,000 multicomponent Class 2 

chemical substances. 

Alkyl Description 

Table l lists the Alkyl Descriptors covered by this system of substance identification; assigned to each is a two- digit Alkyl Descriptor 

Code used in generating the SDA Reporting Numbers , described later. Each 

Descriptor identifies a distribution of alkyl groups in terms of carbon 

chainlength, saturation and/or unsaturation, and linear or branched 

structure . Alkyl group distributions are inclusive of both even and odd 

alkyl chainlengths. 

The Descriptors of Tabl e 1 were chosen to cover the predominant 

long- chain alkyl group distributions actually present in most commercial 

multicomponent Class 2 substances of this type, and to provide for each 

as precise a description as practical. Use of this procedure is predicated 

on selecting the narrowest alkyl distribution (Alkyl Descriptor) which 

describes the predominant long-chain alkyl groups of the substance 

reported . In this con text , the term " predominant 11 means that about 80 

to 100 percent of all long-chain alkyl groups are i ncluded within the 

description . 

In the Alkyl Descriptor, a saturated, linear long- chain alkyl group 

is denoted by "C " \vhere the subscript x indicates the number of carbon 

atoms in the alk~l chain . Unsaturated and multipl e branched alkyl 

groups are denoted by "C unsaturated 11 and "C branched", respectively . X X 

By convention, the number of~carbon atoms in a long-chain alkyl 

group includes all long- chain alkyl and functional group carbon atoms , 

other than those contained in an aromatic ring , which are connected to 

each other in a unbroken chain of carbon-carbon bonds . For example , the 

al kyl chainlength, designated by "R" in the representative structural 

diagrams found in Table 2, includes the acyl carbon of carboxylic acids I 

and their derivatives, and the total number of carbon atoms in such 

structures as R-CH -OH or R- CH=CH2 . The alkyl group does not include, 

however, functionaf group carbon atoms which are part of a phenyl ring , 

or are separated from the alkyl chaJn by a phenyl group or an atom other 

than carbon , e . g . , ~ , R- N(CH3

)

2 , or R-O(CH2

)

3

NH 2. 

Unless specified otherwise, the alkyl groups identified by each 

Alkyl Descriptor are linear , or essentially linear , hydrocarbon chains . 

The natural fats and oils listed below provide such alkyl groups : 

5 
Vegetable Animal Harine 

Avocado Peanut Grease Herring 

Babassu Rapeseed Lard ~1enhaden 

Castor Rice Bran Neatsfoot Salmon 

Coconut Safflo•.ver Poultry Sardine 

Corn Saff lo~ver Tallo\• Sperm Body 

Cottonseed (high oleic) (\vhale) 

Crambe Sesame Sperm Head 

Linseed Sorghum (whale) 

Olive Soybean Whale 

Oiticica Sunflower 

Palm Tung 

Palm-kernel \fueat Germ 

These sources provide both saturated and unsaturated alkyl groups; 

castor oil provides a c

18 hydroxy substituted alkyl group . Alkyl groups 

derived from other natural sources are not covered by this procedure . 

Synthetic sources can provide linear or essentially linear alkyl 

groups, i . e . , chain branching, if any, is limited to no more than one 

secondary methyl (CH3-) or ethyl (C2H5- ) group per alkyl chain. For 

purposes of this section, the latter type of alkyl chain is included 

within the designation "linear". Nultiple branched alkyl groups, derived exclusively from synthetic sources, have separate Alkyl Descriptors. 

Some Class 2 chemical substances covered by this procedure are 

comprised of components \vhich have two or more long-chain alkyl groups, 

e . g ., (clialkyl) amjne, or (dialkyl) dimethyl ammonium chloride. This 

procedure may be used to identity such substances provided that each 

long-chain alkyl group is describable, in its predominant composition, 

by an Alkyl Descriptor found in Table 1 and that none of these longchain alkyl groups is a single c2mponent structure describable by a 

definite chemical structural diagram. 

·' 

6