Plaster of Paris : MSDS

Chemical data sheet for:

PLASTER OF PARIS

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Section 1 - Chemical Identifiers	Section 4 - Physical Properties
Section 2 - Hazards	Section 5 - Regulatory Information
Section 3 - Response Recommendations	Section 6 - Alternate Chemical Names

Section 1 - Chemical Identifiers

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CAS Number - Chemical Abstract Service registry number. Unique identification number assigned to this chemical by the American Chemical Society.

UN/NA Number - The United Nations-North America number (also called UN number or DOT number). Four-digit number identifying an individual chemical or group of chemicals with similar characteristics. Required on shipping papers; often shown on placards or labels. This numbering system was developed by the U.S. Department of Transportation, and then became the UN standard system for classifying hazardous materials.

STCC Number - Standard Transportation Commodity Code. Sounds like "Stick number." Seven-digit chemical identification code used by the Association of American Railroads. A STCC number beginning with "49" indicates a hazardous material.

CHRIS Code - Three-letter code used by the U.S. Coast Guard to identify individual chemicals included in its CHRIS (Chemical Hazards Response Information System) manual.

NFPA 704 - Diamond-shaped label containing codes indicating the level of the chemical's toxic, flammability, and reactivity hazard, along with special hazards such as water- and air-reactivity. See a guide to the "NFPA diamond."

DOT Hazard Label - Required DOT hazard warning label for the chemical (e.g., "Flammable Liquid," "Corrosive"). This label must be displayed on shipped packages, railroad tank cars, and tank trucks according to specifications described in 49 CFR 172.

General Description - Brief description of the general appearance, behavior, and hazardousness of the chemical.

List of data sources.

CAS Number	UN/NA Number	STCC Number	CHRIS Code
26499-65-0	none	none	none

NFPA 704:

NO CODES

DOT Hazard Label:

data unavailable

General Description

White or yellowish, finely divided, odorless powder consisting mostly or entirely of calcium sulfate hemihydrate, CaSO4·1/2H2O. Forms a paste when it is mixed with water that soon hardens into a solid. Used in making casts, molds, and sculpture. Generally non-toxic. (NOAA Reactivity 2007)

Section 2 - Hazards

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Reactivity Alerts - Special alerts for chemicals that are especially reactive. See a table of reactivity alerts and their definitions.

Air & Water Reactions - Special alerts for chemicals that react with air and/or water or moisture.

Fire Hazard - Description of the chemical's flammability, byproducts that may evolve if the chemical is burned, and risk of explosion.

Health Hazard - Description of the health hazards of the chemical, such as toxicity, flammability, and corrosivity.

Reactivity Profile - Description of the potential reactivity between the chemical and other chemicals, as well as its reactivity with air and water, and any other intrinsic reactive hazards (e.g., polymerizability, peroxidizability).

Reactive Groups - The reactive group, or groups, to which the chemical was assigned, based on its known chemistry. Reactive groups are categories of chemicals that react in similar ways because they are similar in their chemical structure. Read more about reactive groups.

Special WMD note - For chemicals that historically have been used as weapons of mass destruction (WMDs) or that could be used as WMDs, a special note describes the physical clues that can help you to assess whether an attack has taken place.

List of data sources.

Reactivity Alerts

none

Air & Water Reactions

No rapid reaction with air No rapid reaction with water

Fire Hazard

No information available.

Health Hazard

Exposure Routes: inhalation, ingestion, skin and/or eye contact

Symptoms: Irritation eyes, skin, mucous membrane, respiratory system; cough

Target Organs: Eyes, skin, respiratory system (NIOSH, 2003)

Reactivity Profile

PLASTER OF PARIS is non-flammable and non-combustible. Has generally low chemical reactivity but can act as an oxidizing agent under extreme conditions. Decomposes at high temperature to generate toxic oxides of sulfur. Reacts exothermically but slowly with moisture in the air or water to form gypsum CaSO4.2H2O. (NOAA REACTIVITY, 2007)

Belongs to reactive group(s)

• Inorganic Compounds/Neither Reducing nor Oxidizing

Section 3 - Response Recommendations

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Fire Fighting - Response recommendations for fire incidents in which the chemical is involved.

Non-Fire Response - Response recommendations for incidents not involving fire, in which the chemical is involved.

Protective Clothing - General recommendations.

First Aid - Recommended first aid treatment for people exposed to the chemical.

List of data sources.

Fire Fighting

No information available.

Non-Fire Response

No information available.

Protective Clothing

Skin: No recommendation is made specifying the need for personal protective equipment for the body.

Eyes: No recommendation is made specifying the need for eye protection.

Wash skin: No recommendation is made specifying the need for washing the substance from the skin (either immediately or at the end of the work shift).

Remove: No recommendation is made specifying the need for removing clothing that becomes wet or contaminated.

Change: No recommendation is made specifying the need for the worker to change clothing after the work shift. (NIOSH, 2003)

First Aid

Eye: If this chemical contacts the eyes, immediately wash the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately. Contact lenses should not be worn when working with this chemical.

Breathing: If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform mouth-to-mouth resuscitation. Keep the affected person warm and at rest. Get medical attention as soon as possible.

Swallow: If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2003)