Synonyms: Dichromic acid, diammonium salt; ammonium
CAS No.: 7789-09-5
Molecular Weight: 252.07
Chemical Formula: (NH4)2Cr2O7
Product Codes: 11157
Ingredient CAS No Percent Hazardous
--------------------------------------- ------------ ------------ ---------
Ammonium Bichromate 7789-09-5 99 - 100% Yes
Inhalation: Corrosive. Extremely destructive to tissues of the mucous
membranes and upper respiratory tract. May cause ulceration and perforation of
the nasal septum. Symptoms may include sore throat, coughing, shortness of
breath, and labored breathing. May produce pulmonary sensitization or allergic
asthma. Higher exposures may cause pulmonary edema.
Ingestion: Corrosive. Swallowing can cause severe burns of the mouth, throat, and stomach, leading to death. Can cause sore throat, vomiting, diarrhea. May cause violent gastroenteritis, peripheral vascular collapse, dizziness, intense thirst, muscle cramps, shock, coma, abnormal bleeding, fever, liver damage and acute renal failure.
Skin Contact: Corrosive. Symptoms of redness, pain, and severe burn can occur. Dusts and strong solutions may cause severe irritation. Contact with broken skin may cause ulcers (chrome sores) and absorption, which may cause systemic poisoning, affecting kidney and liver functions. May cause skin sensitization.
Eye Contact: Corrosive. Contact can cause blurred vision, redness, pain and severe tissue burns. May cause corneal injury or blindness.
Chronic Exposure: Repeated or prolonged exposure can cause ulceration and perforation of the nasal septum, respiratory irritation, liver and kidney damage and ulceration of the skin. Ulcerations at first may be painless, but may penetrate to the bone producing "chrome holes." Known to be a human carcinogen.
Aggravation of Pre-existing Conditions: Persons with pre-existing skin disorders, asthma, allergies or known sensitization to chromic acid or chromates may be more susceptible to the effects of this material.
Inhalation: Remove to fresh air. If not breathing,
give artificial respiration. If breathing is difficult, give oxygen. Get medical
Ingestion: If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person. Get medical attention immediately.
Skin Contact: Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Get medical attention immediately. Wash clothing before reuse. Thoroughly clean shoes before reuse.
Eye Contact: Immediately flush eyes with plenty of water for at least 15 minutes, lifting lower and upper eyelids occasionally. Get medical attention immediately.
Fire: Autoignition temperature: 225C (437F)
Combustible solid. Fire is possible at temperatures above decomposition 180C (356F) or by contact with an ignition source. Decomposition is self-sustaining above 225C (437F) with swelling, release of heat and nitrogen gas, and residue of green chromic oxide.
Explosion: Contact with oxidizable substances may cause extremely violent combustion. Closed containers exposed to heat may explode.
Fire Extinguishing Media: Use flooding amounts of water. Do not use dry chemical, carbon dioxide or Halon. Water spray may be used to keep fire exposed containers cool. Do not allow water runoff to enter sewers or waterways.
Special Information: In the event of a fire, wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode. Closed containers readily rupture at decomposition temperature.
Only specially trained or qualified personnel should handle the emergency. Ventilate area of leak or spill. Wear appropriate personal protective equipment as specified in Section 8.
Protect against physical damage. Store in a dry location separate from combustible, organic or other readily oxidizable materials. Avoid storage on wood floors. Remove and dispose of any spilled dichromates; do not return to original containers. Wear special protective equipment (Sec. 8) for maintenance break-in or where exposures may exceed established exposure levels. Wash hands, face, forearms and neck when exiting restricted areas. Shower, dispose of outer clothing, change to clean garments at the end of the day. Avoid cross-contamination of street clothes. Wash hands before eating and do not eat, drink, or smoke in workplace. Containers of this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings and precautions listed for the product.
Airborne Exposure Limits: - OSHA Permissible
Exposure Limit (PEL):
For chromic acid and chromates, as CrO3 = 0.1 mg/m3 (ceiling)
- ACGIH Threshold Limit Value (TLV):
For water-soluble Cr(VI) compounds, as Cr = 0.05 mg/m3 (TWA), A1 - confirmed human carcinogen.
Ventilation System: A system of local and/or general exhaust is recommended to keep employee exposures below the Airborne Exposure Limits. Local exhaust ventilation is generally preferred because it can control the emissions of the contaminant at its source, preventing dispersion of it into the general work area. Please refer to the ACGIH document, Industrial Ventilation, A Manual of Recommended Practices, most recent edition, for details.
Personal Respirators (NIOSH Approved): If the exposure limit is exceeded and engineering controls are not feasible, a half facepiece particulate respirator (NIOSH type N95 or better filters) may be worn for up to ten times the exposure limit or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest.. A full-face piece particulate respirator (NIOSH type N100 filters) may be worn up to 50 times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency, or respirator supplier, whichever is lowest. If oil particles (e.g. lubricants, cutting fluids, glycerine, etc.) are present, use a NIOSH type R or P filter. For emergencies or instances where the exposure levels are not known, use a full-facepiece positive-pressure, air-supplied respirator. WARNING: Air-purifying respirators do not protect workers in oxygen-deficient atmospheres.
Skin Protection: Wear impervious protective clothing, including boots, gloves, lab coat, apron or coveralls, as appropriate, to prevent skin contact. (Natural rubber).
Eye Protection: Use chemical safety goggles and/or full face shield where dusting or splashing of solutions is possible. Maintain eye wash fountain and quick-drench facilities in work area.
Appearance: Bright, orange-red crystals.
Solubility: 36.4 g/100 g water @ 20C (68F)
Specific Gravity: 2.15
pH: 1% sol. = 3.95 10% sol. = 3.45
% Volatiles by volume @ 21C (70F): 0
Boiling Point: Not applicable.
Melting Point: 180C (356F) Decomposes.
Vapor Density (Air=1): 8.7
Vapor Pressure (mm Hg): No information found.
Evaporation Rate (BuAc=1): No information found.
Stability: Stable under ordinary conditions of use
and storage. Can react explosively when in contact with certain organic
Hazardous Decomposition Products: Burning may produce chrome oxides. Burning may produce ammonia, nitrogen oxides.
Hazardous Polymerization: Will not occur. Ammonia released due to decomposition forms flammable mixtures in air between 16% and 25%.
Incompatibilities: Reducing agents, combustibles, organic materials, strong acids, alcohols, ethylene glycol, carbide, hydrazine, potassium chlorate, sodium nitrite and water. Avoid readily oxidizable substances, such as paper, wood, sulfur, aluminum, plastics, etc.
Conditions to Avoid: Heat, flames, ignition sources and incompatibles.
Investigated as a tumorigen and mutagen.
Ingredient Known Anticipated IARC Category
------------------------------------ ----- ----------- -------------
Ammonium Bichromate (7789-09-5) Yes No 1
Environmental Fate: When released into the soil,
this material may leach into groundwater. When released into water, this
material is not expected to evaporate significantly. This material may
bioaccumulate to some extent. When released into the air, this material may be
removed from the atmosphere to a moderate extent by wet deposition.
Environmental Toxicity: This material is expected to be toxic to aquatic life.
Whatever cannot be saved for recovery or recycling should be handled as hazardous waste and sent to a RCRA approved incinerator or disposed in a RCRA approved waste facility. Processing, use or contamination of this product may change the waste management options. State and local disposal regulations may differ from federal disposal regulations. Dispose of container and unused contents in accordance with federal, state and local requirements.
Domestic (Land, D.O.T.)
Proper Shipping Name: RQ, AMMONIUM DICHROMATE
Hazard Class: 5.1
Packing Group: II
Information reported for product/size: 12KG
International (Water, I.M.O.)
Proper Shipping Name: AMMONIUM DICHROMATE
Hazard Class: 5.1
Packing Group: II
Information reported for product/size: 12KG
Chemical Weapons Convention: No TSCA 12(b): No CDTA: Yes
SARA 311/312: Acute: Yes Chronic: Yes Fire: Yes Pressure: No
Reactivity: Yes (Pure / Solid)
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