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Northwest Foam Products, Inc. Safety Data Sheet

Section 1: Substance Identity and Company Information

Product Name
Northwest Foam Expanded Polystyrene Modified Grade

Northwest Foam Products, Inc.

2390 Rostron Circle Twin Falls, ID 83301

800-398-0804 (8am–5pm MT)

Chemical Name/Synonyms
Modified EPS, Modified Foam Polystyrene

Chemical Family
Ethenylbenzene Homopolymer

Chemical Formula

Section 2: Chemical Composition

IngredientCAS No.Approx. Weight Percentage
Benzene, Ethenyl-, Homopolymer9003-53-6>98%
Hexabromocyclododecane (Fire Retardant)3194-55-6<1%

Section 3: Hazards Identification

Primary Route(s) of Entry Into Body
Inhalation and ingestion

Acute Effects

Dust particles may cause mechanical irritation.

Direct contact may cause slight skin irritation.

May cause respiratory discomfort similar to inhalation of too much “inert” dust.

Chemical Name/Synonyms
Modified EPS, Modified Foam Polystyrene

Biologically inert.

Chronic Effects in Humans
No known adverse effects.

Section 4: First Aid Measures

Eye contact
Hold eyelids open and flush immediately with gentle stream of water for at least 15 minutes.
* Seek medical attention if irritation persists.

Skin contact
Wash exposed areas with mild soap and water.

Move person to fresh air. If breathing is difficult, seek medical attention.

Not likely to cause serious injury if ingested.

Section 5: Fire Fighting Measures

Flash Pt. and Method Used
6750 F (ASTM D-1929 per bead manufacturers)
Special Fire Fighting Instructions: Use self-contained breathing apparatus respirator and approved personal protective clothing.

Extinguishing Media
Water fog, carbon dioxide, foam, and dry chemical.

Auto-Ignition Temperature
8800 F (ASTM D-1929 per bead manufacturers)

Unusual Fire and Explosion Hazards
Combustion causes dense, black smoke. Smoke consists of carbon monoxide, carbon dioxide and styrene. Other undetermined hydrocarbon fractions could be released in small quantities.

Section 6: Handling and Storage

Although expanded polystyrene contains a fire retardant additive, it is considered combustible and adequate protection from sources of ignition should be taken.

Section 7: Exposure Controls and Personal Protection

Personal Protective Equipment

Respiratory Protection
Use approved dust mast when sawing or sanding.

None required.

Eye Protection
Use approved safety glasses/goggles when sawing or sanding.

Section 8: Physical and Chemical Properties

Rigid blocks or boards

Slight hydrocarbon odor.

Physical state


Boiling Point
Not Applicable

Not Applicable

Melting Point
Not Applicable (softening begins at 1600F)

Volatiles by Volume

Vapor Density (Air=1)
Not Applicable

Evaporation Rate

Solubility in water

Specific gravity

Section 9: Stability and Reactivity

The product is stable.

Conditions to Avoid
Fire and high temperatures.

Hydrocarbons, esters, insecticides, amines, and aldehydes.

Hazardous polymerization

Hazardous decomposition
Carbon monoxide, acid gases, water, carbon dioxide, carbon.

Section 10: Toxicological Information

No special ventilation requirements.

Personal Protective Equipment

Respiratory Protection
Use approved dust mast when sawing or sanding.

None required.

Eye Protection
Use approved safety glasses/goggles when sawing or sanding.

Section 11: Ecological Information

Biologically Inert

Section 12: Disposal Considerations

Non-hazardous waste
Dispose of material according to local, state, and federal regulations.

Section 13: Transport Information

Not a “Hazardous Material”

Section 14: Regulations

TSCA Status

Hazard Ratings




Section 15: Other Information

Expanded Polystyrene materials sold for construction use have a fire retardant modifier, but are considered combustible, as are all organic materials. They must not be stored or installed near open flame or any other source of ignition. In addition, when EPS insulation is installed in the interior of a structure, it must be protected by a proper thermal barrier and the installer must review applicable local, state, and federal building codes to determine the correct thermal barrier for the particular application.

The information in the MSDS was obtained from sources which we believe are reliable. However, the information is provided without any warranty, express or implied, regarding its correctness. The conditions or methods of handling, storage, use, and disposal of the product are beyond our control and may be beyond our knowledge. For this and other reasons, we do not assume responsibility and expressly disclaim liability for loss, damage, or expense arising out of or in any way connected with the handling, storage, use, or disposal of the product. This MSDS was prepared and is to be used only for this product. If the product is used as a component in another product, this MSDS information may not be applicable.