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Chemical Datasheet

ARSENIC DISULFIDE

 6.1 - Poison

Chemical Identifiers

CAS Number UN/NA Number DOT Hazard Label USCG CHRIS Code
  • 1303-32-8   (replaced by 12044-79-0)
  • 12044-79-0
  • 1557
  • Poison
  • ARD
NIOSH Pocket Guide International Chem Safety Card
Arsenic (inorganic compounds, as As) none
NFPA 704
data unavailable
General Description
An odorless red-brown solid. Insoluble in water and denser than water. Hence sinks in water. Highly toxic by ingestion and inhalation.

Hazards

Reactivity Alerts
Air & Water Reactions
Burns with a blue flame when heated in air [Mellor 9:270 1946-47]. Insoluble in water.
Fire Hazard
Special Hazards of Combustion Products: Poisonous fumes of the compound may be formed in fires. If ignited, will form sulfur dioxide gas.

Behavior in Fire: May ignite at very high temperatures (USCG, 1999)
Health Hazard
(Acute and sub-acute poisoning are not common.) Repeated inhalation causes irritation of nose, laryngitis, mild bronchitis. Ingestion causes weakness, loss of appetite, gastrointestinal disturbances, peripheral neuritis, occasional hepatitis. Contact with eyes causes irritation. Irritates skin, especially where moist; if not treated, may cause ulceration. (USCG, 1999)
Reactivity Profile
ARSENIC DISULFIDE reacts with oxidizing agents to generate heat and products that may be flammable, combustible, or otherwise reactive. These reactions may be violent. Soluble in acids and alkalis, but not soluble in water. Generates toxic gaseous hydrogen sulfide on contact with acids.
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

Response Recommendations

Isolation and Evacuation
Excerpt from 152 Polymerizable warning [Substances - Toxic (Combustible)]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.

SPILL: Increase the immediate precautionary measure distance, in the downwind direction, as necessary.

FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2020)
Firefighting
Fire Extinguishing Agents: Water (USCG, 1999)
Non-Fire Response
Excerpt from 152 Polymerizable warning [Substances - Toxic (Combustible)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. (ERG, 2020)
Protective Clothing
Approved respirator; goggles; rubber gloves; clean protective clothing (USCG, 1999)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
Consult physician after all overexposure to this compound.

INHALATION: move to fresh air.

INGESTION: induce vomiting by giving warm salt water; repeat until vomit is clear.

EYES: flush with water for at least 15 min.

SKIN: wash well with water. (USCG, 1999)

Physical Properties

Chemical Formula:
  • As2S2
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: 585°F (USCG, 1999)
Vapor Pressure: data unavailable
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 3.5 at 68°F (USCG, 1999) - Denser than water; will sink
Boiling Point: 1049°F at 760 mmHg (USCG, 1999)
Molecular Weight: 214 (USCG, 1999)
Water Solubility: data unavailable
Ionization Energy/Potential: data unavailable
IDLH: 5 mg As/m3 ; A potential occupational carcinogen. (NIOSH, 2023)

AEGLs (Acute Exposure Guideline Levels)

No AEGL information available.

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

No PAC information available.

Regulatory Information

EPA Consolidated List of Lists

Regulatory Name CAS Number/
313 Category Code		 EPCRA 302
EHS TPQ		 EPCRA 304
EHS RQ		 CERCLA RQ EPCRA 313
TRI		 RCRA
Code		 CAA 112(r)
RMP TQ
Arsenic Compounds N020 & 313
Arsenic disulfide 12044-79-0 1 pound 313c

(EPA List of Lists, 2022)

CISA Chemical Facility Anti-Terrorism Standards (CFATS)

No regulatory information available.

OSHA Process Safety Management (PSM) Standard List

No regulatory information available.

Alternate Chemical Names