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AMMONIUM CHROMATE

5.1 - Oxidizer 8 - Corrosive
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The Chemical Identifier fields include common identification numbers, the NFPA diamond, U.S. Department of Transportation hazard labels, and a general description of the chemical. The information in CAMEO Chemicals comes from a variety of data sources.
CAS Number UN/NA Number
  • 7788-98-9
  • 52110-72-2
DOT Hazard Label USCG CHRIS Code
  • Oxidizer
  • Corrosive
NIOSH Pocket Guide International Chem Safety Card
Chromic acid and chromatesexternal link none
NFPA 704
data unavailable
General Description
A yellow crystalline solid. Density 1.866 g / cm3. Soluble in water. Toxic by inhalation (of dust). A strong irritant. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Used in dyeing, photography, chemical analysis, and as a corrosion inhibitor.

The Hazard fields include special hazard alerts, air and water reactions, fire hazards, health hazards, a reactivity profile, and details about reactive groups assignments and potentially incompatible absorbents. The information in CAMEO Chemicals comes from a variety of data sources.
Reactivity Alerts
  • Explosive
  • Strong Oxidizing Agent
Air & Water Reactions
Water soluble
Fire Hazard
Special Hazards of Combustion Products: Decomposes producing toxic combustion products.

Behavior in Fire: Can explode when heated or shocked. (USCG, 1999)
Health Hazard
INHALATION: May cause irritation or ulceration of mucous membranes. EYES: Causes severe irritation and conjunctivitis. SKIN: Irritation, ulceration (chrome sores) where breaks in skin occur. INGESTION: Tends to act as its own emetic and purgative. Can cause stomach and kidney damage if retained. (USCG, 1999)
Reactivity Profile
AMMONIUM CHROMATE readily reacts with reducing materials, including large numbers of organic compounds. These reactions may be violent. A explosion hazard when shocked or heated [Lewis]. Emits toxic fumes of ammonia and nitrogen oxides when heated to decomposition [Sax, 9th ed., 1996, p. 207].
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below. More info about absorbents, including situations to watch out for...

  • Cellulose-Based Absorbents
  • Expanded Polymeric Absorbents

The Response Recommendation fields include isolation and evacuation distances, as well as recommendations for firefighting, non-fire response, protective clothing, and first aid. The information in CAMEO Chemicals comes from a variety of data sources.
Isolation and Evacuation
Excerpt from ERG Guide 140 [Oxidizers]:

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.

LARGE SPILL: Consider initial downwind evacuation for at least 100 meters (330 feet).

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)
Firefighting
Excerpt from ERG Guide 140 [Oxidizers]:

SMALL FIRE: Use water. Do not use dry chemicals or foams. CO2 or Halon® may provide limited control.

LARGE FIRE: Flood fire area with water from a distance. Do not move cargo or vehicle if cargo has been exposed to heat. Move containers from fire area if you can do it without risk.

FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2016)
Non-Fire Response
Excerpt from ERG Guide 140 [Oxidizers]:

Keep combustibles (wood, paper, oil, etc.) away from spilled material. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Do not get water inside containers.

SMALL DRY SPILL: With clean shovel, place material into clean, dry container and cover loosely; move containers from spill area.

SMALL LIQUID SPILL: Use a non-combustible material like vermiculite or sand to soak up the product and place into a container for later disposal.

LARGE SPILL: Dike far ahead of liquid spill for later disposal. Following product recovery, flush area with water. (ERG, 2016)
Protective Clothing
Wear rubber gloves, industrial filter mask, face shield and safety glasses. (USCG, 1999)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
Call a physician.

INHALATION: Move to fresh air.

EYES: Flush with water.

SKIN: Wash with soap and water.

INGESTION: Dilute with water or milk. (USCG, 1999)

The Physical Property fields include properties such as vapor pressure and boiling point, as well as explosive limits and toxic exposure thresholds. The information in CAMEO Chemicals comes from a variety of data sources.
Chemical Formula:
  • (NH4)2CrO4
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: 356 ° F (USCG, 1999)
Vapor Pressure: data unavailable
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 1.91 at 53.6 ° F (USCG, 1999)
Boiling Point: data unavailable
Molecular Weight: 152.09 (USCG, 1999)
Water Solubility: data unavailable
Ionization Potential: data unavailable
IDLH: 15 mg/m3 As Cr(VI); A potential occupational carcinogen. (NIOSH, 2016)

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 chromate (7788-98-9) 0.44 mg/m3 7.7 mg/m3 46 mg/m3
(DOE, 2016)

The Regulatory Information fields include information from the U.S. Environmental Protection Agency's Title III Consolidated List of Lists, the U.S. Department of Homeland Security's Chemical Facility Anti-Terrorism Standards, and the U.S. Occupational Safety and Health Administration's Process Safety Management of Highly Hazardous Chemicals Standard List (see more about these data sources).

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
Ammonium chromate 7788-98-9 10 pounds 313c
Chromium Compounds N090 & 313

(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.

This section provides a listing of alternate names for this chemical, including trade names and synonyms.
  • AMMONIUM CHROMATE
  • AMMONIUM CHROMATE ((NH4)2CRO4)
  • AMMONIUM CHROMATE(VI)
  • CHROMIC ACID AMMONIUM SALT
  • CHROMIC ACID, AMMONIUM SALT
  • DIAMMONIUM CHROMATE
  • DIAMMONIUM CHROMATE ((NH4)2CRO4)
  • NEUTRAL AMMONIUM CHROMATE

Version 2.7.1