- Ammonium bichromate
- Ammonium dichromate(VI)
- Chromic acid, diammonium salt
Ammonium dichromate is a bright orange red crystalline solid.
Source of pure nitrogen, catalyst, dye mordant, pickling agent.
Registry Numbers and Inventories.
EC Index Number
Explosive; Explosive when dry; Oxidising; Carcinogenic Category 2; Mutagenic Category 2; Very toxic; Toxic; Harmful; Irritant; Sensitising; Dangerous for the Environment
R 49 46 1 8 E21 E25 E26 37/38 41 43 50/53
S 53 45 60 61
Tumorigen; Mutagen; Human Data
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
2.15 g/cm3 (20 C)
Solubility in water
36 g/100 mL
8,28 (25 C)
Hazards and Protection.
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Do not store near combustible materials. Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from acids. Keep away from reducing agents.
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Do not ingest or inhale. Do not store near combustible materials. Discard contaminated shoes. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Remove all sources of ignition. Wet area to prevent drying out. Provide ventilation. Do not use combustible materials such as paper towels to clean up spill. Keep combustibles (wood, paper, oil, etc.,) away from spilled material.
Stable under normal shipping and handling conditions. However, may decompose if heated.
Reducing agents, carbides, hydrazine, combustible organics, wood, sulfur, aluminum, plastics, potassium chlorates, sodium nitrate.
Oxides of nitrogen, irritating and toxic fumes and gases, toxic chromium oxide fumes.
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Strong oxidizer. Contact with combustible materials may cause a fire. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water with caution and in flooding amounts. This material poses an explosion hazard when dry. Extinguishing media: Use water only! Contact professional fire-fighters immediately. Cool containers with flooding quantities of water until well after fire is out. For large fires, flood fire area with water from a distance. DO NOT use dry chemicals, carbon dioxide, Halon or foams.
Moderately flammable. Will ignite if exposed to open flame or sparks moderate hazard.
May explode from heat or contamination.
Greenish chromic oxide smoke may cause irritation of lungs and mucous membranes.
TLV: 0.025 ppm; 0.16 mg/m3 (ACGIH 1991-1992). NIOSH REL: Ca 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C NIOSH IDLH: Potential occupational carcinogen
G-A1, I-1, N-1, CP65
Prolonged or repeated inhalation may cause nosebleeds, nasal congestion, erosion of the teeth, perforation of the nasal septum, chest pain and bronchitis. Prolonged or repeated eye contact may cause conjunctivitis. Prolonged or repeated skin contact may cause sensitization dermatitis and possible destruction and/or ulceration. May cause cancer according to animal studies. Effects may be delayed. Laboratory experiments have resulted in mutagenic effects.
Harmful if swallowed. May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns. May cause circulatory system failure. May cause perforation of the digestive tract. Methemoglobinemia is characterized by dizziness, drowsiness, headache, breath shortness, cyanosis with bluish skin, rapid heart rate and chocolate-brown colored blood. May cause hemolysis. May cause nausea, vomiting, and diarrhea, possibly with blood.
Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. May cause asthmatic attacks due to allergic sensitization of the respiratory tract. May cause ulceration and perforation of the nasal septum if inhaled in excessive quantities. Causes chemical burns to the respiratory tract. Aspiration may lead to pulmonary edema. May cause systemic effects.
Causes skin burns. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause deep, penetrating ulcers of the skin. May be absorbed through the skin.
Causes eye burns. May cause permanent corneal opacification.
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).
USCG CHRIS Code
2841 50 00
Std. Transport #