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Chemical Datasheet
AMMONIUM DICHROMATE |
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Chemical Identifiers
CAS Number |
UN/NA Number |
DOT Hazard Label |
USCG CHRIS Code |
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NIOSH Pocket Guide |
International Chem Safety Card |
Chromic acid and chromates
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NFPA 704
General Description
Ammonium dichromate is a bright orange red crystalline solid. It is readily ignited and burns producing a voluminous green residue. If heated in a closed container, the container may rupture due to the decomposition of the material. It may also act as a strong oxidizing agent if mixed with or contaminated with combustible material. It is soluble in water.
Hazards
Reactivity Alerts
- Explosive
- Strong Oxidizing Agent
Air & Water Reactions
Water soluble.
Fire Hazard
Special Hazards of Combustion Products: Greenish chromic oxide smoke may cause irritation of lungs and mucous membranes.
Behavior in Fire: Decomposes at about 180°C. Decomposition self-sustaining at about 225°C with spectacular swelling and evolution of heat and nitrogen, leaving chromic oxide residue. Pressure of confined gases can burst closed containers explosively. (USCG, 1999)
Health Hazard
Inhalation causes irritation or ulceration of the mucous membranes of the nose, throat or respiratory tract. Respiratory irritation can produce symptoms resembling those of asthma. Continuing irritation of the nose may lead to perforation of the nasal septum. External contact can cause eye irritation and conjunctivitis, irritation and ulceration of skin wounds, and rash or external ulcers. If ingested, irritates mucous membrane and causes vomiting. (USCG, 1999)
Reactivity Profile
It is an oxidizing reagent, it readily reacts with reducing materials, in large quantity it may produce a violent reaction. Direct exposure to heat or shock will explode it. When heated to decomposition it emits toxic fumes of ammonia and nitrogen oxides [Sax, 9th ed., 1996, p. 205].
Belongs to the Following Reactive Group(s)
- Salts, Acidic
- Oxidizing Agents, Strong
Potentially Incompatible Absorbents
Use caution: Liquids with this reactive group classification have been
known to react with the
absorbents
listed below.
- Cellulose-Based Absorbents
- Expanded Polymeric Absorbents
Response Recommendations
Isolation and Evacuation
Excerpt from 141
[Oxidizers - Toxic]:
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, 2020)
Firefighting
Excerpt from 141
[Oxidizers - Toxic]:
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. If it can be done safely, move undamaged containers away from the area around the fire.
FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned master stream devices 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 master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2020)
Non-Fire Response
Excerpt from 141
[Oxidizers - Toxic]:
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.
SMALL DRY SPILL: With clean shovel, place material into clean, dry container and cover loosely; move containers from spill area.
LARGE SPILL: Dike far ahead of spill for later disposal. (ERG, 2020)
Protective Clothing
Dust respirator; protective goggles, gloves, clothing. (USCG, 1999)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
INHALATION: remove to clean air and summon medical attention.
EYES: immediately flush with water for at least 15 min. and consult a physician.
SKIN: flush with water; if skin irritation develops, get medical attention.
INGESTION: vomiting should occur; follow with an emetic of soapy water; give large amounts of water. (USCG, 1999)
Physical Properties
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature:
437°F
(USCG, 1999)
Melting Point: data unavailable
Vapor Pressure: data unavailable
Vapor Density (Relative to Air): data unavailable
Specific Gravity:
2.15
at 77°F
(USCG, 1999)
- Denser than water; will sink
Boiling Point: data unavailable
Molecular Weight:
252.06
(USCG, 1999)
Water Solubility: data unavailable
Ionization Energy/Potential: data unavailable
IDLH:
15 mg Cr(VI)/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)
Chemical |
PAC-1 |
PAC-2 |
PAC-3 |
Ammonium dichromate (7789-09-5)
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0.37 mg/m3 |
6.3 mg/m3 |
38 mg/m3 |
(DOE, 2018)
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 |
Ammonium bichromate |
7789-09-5 |
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10 pounds |
313c |
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Chromium Compounds |
N090 |
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& |
313 |
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(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
- AMMONIUM BICHROMATE
- AMMONIUM CHROMATE ((NH4)2CR2O7)
- AMMONIUM DICHROMATE
- AMMONIUM DICHROMATE(VI)
- DIAMMONIUM DICHROMATE
- DICHROMIC ACID (H2CR2O7), DIAMMONIUM SALT