Page 1 of 8 Revision date 09/16/2008

Material Safety Data Sheet

1. PRODUCT AND COMPANY IDENTIFICATION

MOR-FREE TM 421

Revision date: 09/16/2008

Supplier ROHM AND HAAS CHEMICALS LLC

A Subsidiary of The Dow Chemical Company

100 INDEPENDENCE MALL WEST

PHILADELPHIA, PA 19106-2399 United States

For non-emergency information contact: 215-592-3000

For non-emergency information contact: 215-592-3000

Emergency telephone number

1 800 424 9300

Local emergency telephone number

989-636-4400

2. COMPOSITION/INFORMATION ON INGREDIENTS

Component CAS-No. Concentration

Polyurethane resin Not Hazardous 63.0 - 67.0%

Isocyanato-2-{(4-

isocyanatophenyl)methyl}benzene

5873-54-1 33.0 - 37.0%*

Methylenebis(4-phenyl isocyanate) 101-68-8 33.0 - 37.0%*

NOTE: The “*”, or “asterisk”, in the CONCENTRATION column is used to denote 2 or more 

components whose identical concentrations sum to the total indicated to the left of the “asterisk”.

3. HAZARDS IDENTIFICATION

Emergency Overview

Appearance

Form viscous liquid 

Colour Pale yellow translucent 
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Hazard Summary WARNING!

INHALATION OF VAPOR OR MIST CAN CAUSE THE 

FOLLOWING:

SHORTNESS OF BREATH

TIGHTNESS IN THE CHEST

IRRITATING TO EYES AND SKIN.

MAY CAUSE SENSITIZATION BY INHALATION AND SKIN 

CONTACT.

LONG TERM EXPOSURE TO DIISOCYANATES MAY CAUSE 

LUNG DAMAGE, INCLUDING REDUCED LUNG FUNCTION, 

WHICH MAY BE PERMANENT.

CLOSED CONTAINERS MAY EXPLODE WHEN HEATED OR 

CONTENTS CONTAMINATED WITH WATER.

Potential Health Effects

Primary Routes of Entry: Inhalation

 Eye contact

 Skin contact

Eyes: Material can cause the following:

Moderate irritation.

burning sensation

tearing

reddening

Skin: May cause sensitization by skin contact.

Material can cause the following:

Moderate irritation.

burning sensation

reddening

Itching

Ingestion: Material can cause the following:

severe irritation of the mouth, throat, and digestive tract

diarrhea

nausea

Vomiting

Abdominal pain

Inhalation: Inhalation of vapor or mist can cause the following:

coughing

irritation of nose, throat, and lungs

tightness in the chest

Shortness of breath

May cause severe allergic respiratory reaction.

Sensitisation

Chronic Exposure: Long term exposure to diisocyanates may cause lung damage, including reduced 

lung function, which may be permanent.

Methylenebis(4-phenyl isocyanate) IRIS Not classifiable.

Methylenebis(4-phenyl isocyanate) IARC Inadequate data.

Methylenebis(4-phenyl isocyanate) IARC No data.

Methylenebis(4-phenyl isocyanate) IARC No data.

Methylenebis(4-phenyl isocyanate) IARC Classification not possible 

from current data.
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4. FIRST AID MEASURES

Inhalation: Remove to fresh air. In case of shortness of breath, give oxygen. Immediate medical

attention is required.

Skin contact: Take off all contaminated clothing immediately. Wash off immediately with soap and 

plenty of water. If skin irritation persists, call a physician. Wash contaminated clothing before re-use. 

Do not take clothing home to be laundered.

Eye contact: Rinse immediately with plenty of water for at least 15 minutes. If eye irritation persists, 

consult a specialist.

Ingestion: Never give anything by mouth to an unconscious person. Do NOT induce vomiting. Drink 

1 or 2 glasses of water. Call a physician immediately. If a person vomits when lying on his back, 

place him in the recovery position.

Notes to physician: Bronchial constriction may develop after extensive exposure to isocyanates, 

even in individuals who have not been shown to be previously sensitized.

5. FIRE-FIGHTING MEASURES

Flash point >93 °C ( 200.1 °F ) SETAFLASH CLOSED CUP

Ignition temperature ca.> 400.0 ( > 752.00 °F) 

Lower explosion limit no data available

Upper explosion limit no data available

Thermal decomposition During a fire, irritating and highly toxic gases and/or fumes may be 

generated during combustion or decomposition.

Combustion Products: Hydrogen Cyanide

Carbon monoxide

Carbon dioxide

Nitrogen oxide (NO2)

Suitable extinguishing media:Foam

Carbon dioxide (CO2)

Dry powder

Specific hazards during fire fighting: Do not allow run-off from fire fighting to enter drains or water 

courses. Closed containers may explode when heated or contents contaminated with water.

Special protective equipment for fire-fighters: In the event of fire, wear self-contained breathing 

apparatus.

Further information: Fire residues and contaminated fire extinguishing water must be disposed of in 

accordance with local regulations.

Collect contaminated fire extinguishing water separately. This must not be discharged into drains.

6. ACCIDENTAL RELEASE MEASURES

Personal precautions

Ventilate the area.

Refer to protective measures listed in sections 7 and 8.

MATERIAL IS A POTENTIAL SENSITIZER.

Environmental precautions

Try to prevent the material from entering drains or water courses.

Do not contaminate surface water.

Methods for cleaning up

Ventilate the area.

Evacuate personnel to safe areas.

Floor may be slippery; use care to avoid falling.

Contain spills immediately with inert materials (e.g., sand, earth).
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Transfer liquids and solid diking material to separate suitable containers for recovery or disposal.

Additional advice: No conditions to be specially mentioned.

7. HANDLING AND STORAGE

Handling

Avoid contact with skin and eyes. For personal protection see section 8. CONTAINERS MAY BE 

HAZARDOUS WHEN EMPTY. Since emptied containers retain product residue follow all MSDS and 

label warnings even after container is emptied.

Storage

Storage conditions: Keep container tightly closed in a dry and well-ventilated place.

Further information:

This material is a potential skin sensitizer. See SECTION 8, Exposure Controls/Personal Protection, 

prior to handling.

8. EXPOSURE CONTROLS/PERSONAL PROTECTION

Exposure limit(s)

Exposure limits are listed below, if they exist.

Component Regulation Type of listing Value

Isocyanato-2-{(4-

isocyanatophenyl)methyl}be

nzene

Rohm and Haas TWA 0.005 ppm

Rohm and Haas STEL 0.02 ppm

Component Regulation Type of listing Value

Methylenebis(4-phenyl 

isocyanate)

Rohm and Haas TWA 0.005 ppm

Rohm and Haas STEL 0.02 ppm

ACGIH TWA 0.005 ppm

NIOSH/GUIDE REL 0.05 mg/m3 0.005 ppm

NIOSH/GUIDE Ceil_Time 0.2 mg/m3 0.020 ppm

OSHA_TRANS Ceiling 0.2 mg/m3 0.02 ppm

Z1A Ceiling 0.2 mg/m3 0.02 ppm

Eye protection: Tightly fitting safety goggles Eye protection worn must be compatible with respiratory 

protection system employed.

Hand protection: Chemical-resistant gloves should be worn whenever this material is handled. The 

glove(s) listed below may provide protection against permeation. (Gloves of other chemically resistant 

materials may not provide adequate protection): 4H Glove (Trademark of Safety 4 A/S of Denmark) 

butyl-rubber Gloves should be removed and replaced immediately if there is any indication of 

degradation or chemical breakthrough. Before removing gloves clean them with soap and water. 

NOTE: Material is a possible skin sensitizer.

Skin and body protection: Protective suit Safety shoes

Respiratory protection: A respiratory protection program meeting OSHA 1910.134 and ANSI Z88.2 

requirements or equivalent must be followed whenever workplace conditions warrant a respirator‟s 

use. None required if airborne concentrations are maintained below the exposure limit listed in 

Exposure Limit Information. Above the exposure limit: Wear a properly fitted NIOSH approved (or 

equivalent) self-contained breathing apparatus in the pressure demand mode, OR full-facepiece, 

airline respirator in the pressure demand mode with emergency escape provision.

Hygiene measures: Keep container closed when not in use. Shower or bathe at the end of working.

Protective measures: Facilities storing or utilizing this material should be equipped with an eyewash 

facility and a safety shower.
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Engineering measures: Use local exhaust ventilation with a minimum capture velocity of 100 

ft/min. (0.5 m/sec.) at the point of vapor evolution. Refer to the current edition of Industrial Ventilation: 

A Manual of Recommended Practice published by the American Conference of Governmental 

Industrial Hygienists for information on the design, installation, use, and maintenance of exhaust 

systems.

9. PHYSICAL AND CHEMICAL PROPERTIES

Appearance

Form viscous liquid 

Colour Pale yellow translucent 

pH not applicable

Boiling point/boiling range no data available

Flash point >93 °C ( 200.1 °F) SETAFLASH CLOSED CUP

Ignition temperature ca.> 400 (> 752.00 °F) 

Lower explosion limit no data available

Upper explosion limit no data available

Vapour pressure no data available

Relative vapour density no data available

Water solubility insoluble

Relative density 1.12

Viscosity, dynamic 2,500 - 3,500 mPa.s

Evaporation rate no data available

Percent volatility negligible

NOTE: The physical data presented above are typical values and should not be construed as a 

specification.

10. STABILITY AND REACTIVITY

Hazardous reactions Stable under recommended storage conditions.

However, keep away from moisture, heat or flame.

Conditions to avoid None known. 

Materials to avoid Avoid contact with the following: Water Strong acids Strong bases 

Strong Oxidizers 

Hazardous 

decomposition 

products

Thermal decomposition may yield the following:, isocyanate monomers, 

Hydrogen cyanide (hydrocyanic acid), 

11. TOXICOLOGICAL INFORMATION

No toxicity data are available for this material.

Component: Methylenebis(4-phenyl isocyanate)

Acute oral toxicity LD50 rat 31,600 mg/kg

Component: Methylenebis(4-phenyl isocyanate)
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Acute inhalation 

toxicity

LC50 rat male 4.0 h 369 mg/m3

Component: Methylenebis(4-phenyl isocyanate)

Acute inhalation 

toxicity

LC50 rat 1 h 2.24 mg/l

Component: Methylenebis(4-phenyl isocyanate)

Acute inhalation 

toxicity

LC50 rat female 4 h 380 mg/m3

Component: Methylenebis(4-phenyl isocyanate)

Acute dermal toxicity LD50 rabbit > 9,400 mg/kg

Component: Methylenebis(4-phenyl isocyanate)

Sensitisation Skin and respiratory sensitizer

12. ECOLOGICAL INFORMATION

There is no data available for this product.

13. DISPOSAL CONSIDERATIONS

Environmental precautions: Try to prevent the material from entering drains or water courses.

Do not contaminate surface water.

Disposal

Waste Classification: When a decision is made to discard this material as supplied, it does not meet 

RCRA‟s characteristic definition of ignitability, corrosivity, or reactivity, and is not listed in 40 CFR 

261.33. The toxicity characteristic (TC), however, has not been evaluated by the Toxicity 

Characteristic Leaching Procedure (TCLP).

Incinerate liquid and contaminated solids in accordance with local, state, and federal regulations. (See 

40 CFR 268)

14. TRANSPORT INFORMATION

DOT

Proper shipping name Environmentally hazardous substances, liquid, 

n.o.s.(Methylene bisphenyl isocyanate (MDI))

UN-Number UN 3082

Class 9

Packing group III

Reportable Quantity Methylene bisphenyl isocyanate (MDI)

IMO/IMDG

Not regulated (Not dangerous for transport)

Transportation classifications may vary by container volume and may be influenced by regional or 

country variations in regulations

15. REGULATORY INFORMATION

Workplace Classification

This product is considered hazardous under the OSHA Hazard Communication Standard (29 CFR 

1910.1200).
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This product is a „controlled product‟ under the Canadian Workplace Hazardous Materials Information 

System (WHMIS).

SARA TITLE III: Section 311/312 Categorizations (40CFR370): Acute Health Hazard

Chronic Health Hazard

Reactivity Hazard

SARA TITLE III: Section 313 Information (40CFR372)

This product contains a chemical which is listedin Section 313 at or above de minimis concentrations. 

The following listed chemicals are present: (Quantity present is found elsewhere on this MSDS.)

SARA Title III Components: Methylenebis(4-phenyl isocyanate) 101-68-8

CERCLA Information (40CFR302.4)

This material is regulated under the Comprehensive Environmental Response, Compensation and 

Liability Act (CERCLA)and the Superfund Amendments and Reauthorization Act (SARA) Title III 

Section 304. This material is or contains chemical(s) listed in 40 CFR Table 302.4 or nondesignated 

RCRA ICR substance(s). (Nondesignated ICR substances apply to materials that will not be reused.) 

The Reportable Quantity(s) (RQ) are listed below. Releases in excess of its reportable quantity must 

be reported to the National Response Center (1-800-424-8802) and to the appropriate state and local 

emergency response organizations.

See Section 13, Disposal Considerations, Subsection Disposal, for CERCLA classification.

CERCLA Components: Methylenebis(4-phenyl 

isocyanate)

101-68-8 5,000 lbs RQ

US. Toxic Substances Control Act (TSCA): All components of this product are in compliance 

with the inventory listing requirements of the U.S. Toxic Substances Control Act (TSCA) Chemical 

Substance Inventory.

Pennsylvania

Any material listed as “Not Hazardous” in the CAS REG NO. column of SECTION 2, 

Composition/Information On Ingredients, of this MSDS is a trade secret under the provisions of the 

Pennsylvania Worker and Community Right-to-Know Act.

16. OTHER INFORMATION

Hazard Rating

Health Fire Reactivity

HMIS 2* 1 1

HMIS: * = Chronic Effects (See Hazards Identification)

Legend

ACGIH American Conference of Governmental Industrial Hygienists

BAc Butyl acetate

OSHA Occupational Safety and Health Administration

PEL Permissible Exposure Limit

STEL Short Term Exposure Limit (STEL):

TLV Threshold Limit Value

TWA Time Weighted Average (TWA):

| Bar denotes a revision from prior MSDS.

The information provided in this Safety Data Sheet is correct to the best of our knowledge, information 

and belief at the date of its publication. The information given is designed only as a guidance for safe 
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handling, use, processing, storage, transportation, disposal and release and is not to be considered a 

warranty or quality specification. The information relates only to the specific material designated and 

may not be valid for such material used in combination with any other materials or in any process, 

unless specified in the text.

Version: 1.0

Print Date: 11/08/2012

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