Chemical Datasheet


8 - Corrosive

Chemical Identifiers

CAS Number UN/NA Number DOT Hazard Label USCG CHRIS Code
  • 1113-38-8   (hydrated salt 2:1)
  • 5972-73-6   (monohydrate salt)
  • 6009-70-7   (monohydrate)
  • 14258-49-2   (salt 2:1)
  • 1759
  • Corrosive
  • AOX
NIOSH Pocket Guide International Chem Safety Card
NFPA 704
data unavailable
General Description
Odorless solid. Sinks and mixes slowly with water. (USCG, 1999)


Reactivity Alerts
Air & Water Reactions
Water soluble.
Fire Hazard
Special Hazards of Combustion Products: Toxic oxides of nitrogen may form in fire. (USCG, 1999)
Health Hazard
Ingestion or excessive inhalation of dust causes systemic poisoning; possible symptoms include pain in throat, esophagus, and stomach; mucous membranes turn white; vomiting, severe purging, weak pulse, cardiovascular collapse, neuromuscular symptoms. Contact with eyes causes irritation. Contact with skin causes irritation or severe burns. (USCG, 1999)
Reactivity Profile
AMMONIUM OXALATE can act as a reducing agent in reactions that generate carbon dioxide. Reacts within a few seconds with solutions of sodium hypochlorite [Mellor 2 Supp. 1:550 1956].
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

Response Recommendations

Isolation and Evacuation
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:

As an 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, in the downwind direction, as necessary, the isolation distance shown above.

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, 2016)
Fire Extinguishing Agents: Water, foam (USCG, 1999)
Non-Fire Response
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames in 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. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. (ERG, 2016)
Protective Clothing
Approved dust respirator; rubber or plastic-coated gloves; chemical goggles (USCG, 1999)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
Speed is essential.

INHALATION: remove to fresh air.

INGESTION: call physician immediately; induce vomiting.

EYES: flush with water and seek medical attention.

SKIN: flush with water.

OTHER: watch for swelling of the glottis and delayed constriction of the esophagus. (USCG, 1999)

Physical Properties

Chemical Formula:
  • (NH4)2C2O4
  • (NH4)2C2O4.H2O
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: data unavailable
Vapor Pressure: data unavailable
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 1.5 at 65.3 ° F (USCG, 1999)
Boiling Point: data unavailable
Molecular Weight: 142.11 (USCG, 1999)
Water Solubility: data unavailable
Ionization Potential: data unavailable
IDLH: data unavailable

AEGLs (Acute Exposure Guideline Levels)

No AEGL information available.

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

Chemical PAC-1 PAC-2 PAC-3
Diammonium oxalate; (Ethanedioic acid, diammonium salt) (1113-38-8) 30 mg/m3 330 mg/m3 2000 mg/m3
Ammonium oxalate monohydrate (5972-73-6) 30 mg/m3 330 mg/m3 2000 mg/m3
Ammonium oxalate; (Diammonium oxalate monohydrate) (6009-70-7) 30 mg/m3 330 mg/m3 2000 mg/m3
(DOE, 2016)

Regulatory Information

EPA Consolidated List of Lists

Regulatory Name CAS Number/
313 Category Code
CAA 112(r)
Ammonium oxalate 14258-49-2 5000 pounds
Ammonium oxalate 5972-73-6 5000 pounds
Ammonium oxalate 6009-70-7 5000 pounds

(EPA List of Lists, 2015)

DHS Chemical Facility Anti-Terrorism Standards (CFATS)

No regulatory information available.

OSHA Process Safety Management (PSM) Standard List

No regulatory information available.

Alternate Chemical Names