Chemical Datasheet


Chemical Identifiers

CAS Number UN/NA Number DOT Hazard Label USCG CHRIS Code
  • 7722-76-1
  • 7783-28-0
none data unavailable
  • APP
NIOSH Pocket Guide International Chem Safety Card
NFPA 704
data unavailable
General Description
White solid with a weak odor of ammonia. Sinks and mixes with water. (USCG, 1999)


Reactivity Alerts
Air & Water Reactions
Water soluble.
Fire Hazard
Special Hazards of Combustion Products: Toxic and irritating fumes of ammonia and oxides of nitrogen may form in fires. (USCG, 1999)
Health Hazard
Inhalation of monoammonium form causes irritation of mucous membranes; with diammonium form, ammonia vapors in closed area can cause pulmonary edema and asphyxia. Contact with solid or with ammonia gas causes irritation of eyes and skin. (USCG, 1999)
Reactivity Profile
Decomposition of sodium hypochlorite takes place within a few seconds with the following salts: ammonium acetate, ammonium carbonate, ammonium nitrate, ammonium oxalate, and ammonium phosphate [Mellor 2 Supp. 1:550 1956]. Several liquid ammonium phosphate fertilizer tanks have ruptured due to inadequate tank design and maintenance. The failure of these tanks were not considered hazardous, except that the failure of these tanks caused failure of nearby tanks of chemicals such as ammonia (anhydrous) and phosphoric acid. (EPA Chemical Safety Alert)
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

Response Recommendations

Isolation and Evacuation
No information available.
No information available.
Non-Fire Response
No information available.
Protective Clothing
Dust mask, protective gloves, and goggles. When diammonium phosphate is stored in closed area, self-contained breathing apparatus is required to protect against ammonia fumes. (USCG, 1999)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
INHALATION: if exposed to ammonia fumes from diammonium phosphate, give artificial respiration and oxygen if needed; enforce rest.

EYES: flush with water for at least 15 min.; if irritation persists, get medical attention.

SKIN: flush with water. (USCG, 1999)

Physical Properties

Chemical Formula:
  • H6NO4P, monobasic
  • H9N2O4P, dibasic
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: Diammonium: 1.8 at 68.0°F Monoammonium: 1.6 at 20°C (USCG, 1999)
Boiling Point: data unavailable
Molecular Weight: Monoammonium: 115 Diammonium: 132 (USCG, 1999)
Water Solubility: data unavailable
Ionization Energy/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
Ammonium dihydrogen phosphate; (Monoammonium phosphate) (7722-76-1) 17 mg/m3 190 mg/m3 1100 mg/m3
Ammonium phosphate dibasic; (Diammonium phosphate) (7783-28-0) 20 mg/m3 210 mg/m3 1300 mg/m3
(DOE, 2018)

Regulatory Information

EPA Consolidated List of Lists

No regulatory information available.

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