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Product Name: Ammonium Dichromate
Chemical Formula: (NH4)2Cr2O7
CAS Number: 7789-09-5
Synonyms: Ammonium bichromate, Diammonium dichromate
Recommended Use: Laboratory reagent, pyrotechnics, photography, textile dyeing, catalyst
Supplier Details: [Contact info dependent on distributor]
Emergency Contact: Refer to local poison control or emergency services
GHS Classification: Oxidizing Solid (Category 2), Acute Toxicity Oral (Category 3), Acute Toxicity Inhalation (Category 2), Skin Corrosion/Irritation (Category 1B), Eye Damage (Category 1), Germ Cell Mutagenicity (Category 1B), Carcinogenicity (Category 1B), Reproductive Toxicity (Category 1B)
Pictograms: Skull and Crossbones, Flame over Circle, Health Hazard, Corrosion, Environment
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage, may cause cancer, strong oxidizer, toxic if inhaled or swallowed, very toxic to aquatic life with long-lasting effects
Precautionary Statements: Avoid breathing dust, wear protective clothing and eye/face protection, do not eat, drink, or smoke during use, wash hands thoroughly after handling, keep away from heat/sparks/open flames/hot surfaces, avoid release to the environment
Chemical Name: Ammonium Dichromate
CAS Number: 7789-09-5
Purity: >98%
Relevant impurities: Trace amounts of other chromium compounds possible, but content usually meets reagent standards
EC Number: 232-143-1
Molecular Weight: 252.07 g/mol
Inhalation: Move person to fresh air immediately, seek medical attention even for mild symptoms; if breathing has stopped, start artificial respiration
Skin Contact: Remove contaminated clothing, flush skin with plenty of running water for at least 15 minutes, call a physician
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present and easy to do, keep rinsing and get medical help right away
Ingestion: Do not induce vomiting, rinse mouth, never give anything by mouth to an unconscious person, seek hospital care urgently
Note to Physicians: Treat symptomatically, chromium compounds cause significant tissue burns and kidney damage, monitor for delayed effects
Suitable Extinguishing Media: Use large amounts of water only, avoid dry chemical or foam for large fires since substance is a strong oxidizer
Unsuitable Extinguishing Media: Avoid carbon dioxide, alcohol-resistant foams and dry metal-based extinguishers as these can cause violent reactions
Hazards from Combustion: Toxic chromium oxides, ammonia, nitrogen oxides may evolve in fire
Protective Equipment: Firefighters need self-contained breathing apparatus and full protective gear
Advice for Firefighters: Cool containers with water spray from a safe distance, evacuate area if large quantities or containers involved; area should be isolated due to strong oxidizing properties that increase fire intensity
Personal Precautions: Use personal protective equipment, avoid breathing dust, ensure proper ventilation, wash skin thoroughly after clean-up
Environmental Precautions: Prevent spill from entering drains or watercourses, notify environmental authorities in case of large spill
Methods for Containment and Cleaning Up: Stop leak if safe, avoid raising dust, sweep or scoop up with non-sparking tools, place in dry container for hazardous waste disposal
Decontamination: Wash affected area with plenty of water, avoid use of reducing agents
Safe Handling: Keep away from heat/open flame/hot surfaces, use spark-proof tools, implement local exhaust or general ventilation, handle in chemical fume hood
Hygiene Measures: Do not eat, drink, or smoke during use; wash hands, face, and exposed skin after handling
Safe Storage: Store in tightly closed original container, in a cool, dry, and well-ventilated area, keep away from combustible material, acids, and reducing agents
Incompatibilities: Strong acids, organic materials, easily oxidizable substances, powdered metals, alcohols
Packing Materials: Use containers made of compatible materials like polyethylene or glass with secure lids, label area clearly with hazard warnings
Occupational Exposure Limits: OSHA PEL: 0.005 mg/m3 (as Cr(VI)), NIOSH REL: 0.001 mg/m3 (as Cr(VI)), ACGIH TLV: 0.05 mg/m3 (as Cr(VI))
Engineering Controls: Local exhaust ventilation or process enclosure to prevent dust accumulation
Personal Protection: Protective gloves (nitrile/neoprene), full-length chemical-resistant clothing, goggles or face shield, use of a properly fitted respirator certified for particulates and chromium compounds
Environmental Controls: Procedures for waste, wastewater, and effluents need regulatory compliance due to high aquatic toxicity
Appearance: Orange-red crystalline solid
Odor: Odorless
pH: Acidic solution
Melting Point: 170°C (decomposes)
Boiling Point: Not applicable, decomposes
Solubility in Water: Soluble (approx. 100 g/L at 20°C)
Specific Gravity: 2.15 (water = 1)
Vapor Pressure: Negligible
Evaporation Rate: Not applicable
Vapor Density: Not applicable
Flash Point: Non-flammable, but supports combustion strongly as oxidizer
Partition Coefficient: Not available
Decomposition Products: Chromium oxides, ammonia, nitrogen oxides
Stability: Stable under normal ambient and storage conditions; unstable in conditions of moisture, heat, or in the presence of organic/combustible materials
Reactive Hazards: Strong oxidizing agent, violent reaction with reducing agents, metals, combustibles, acids
Hazardous Decomposition: Chromium (VI) oxides, ammonia, nitrogen oxides
Polymerization: Does not occur
Other Data: Exothermic decomposition can happen under inappropriate storage, release of toxic/corrosive gases possible
Likely Routes of Exposure: Inhalation, ingestion, skin, and eye contact
Acute Effects: Highly toxic by all routes, severe tissue and organ damage possible, risk of shock from chemical burns
Chronic Effects: May cause cancer, heritable genetic defects, respiratory tract effects (nasal ulceration, chronic inflammation), nephrotoxicity, reproductive harm
LD50 / LC50 Values: LD50 Oral (rat): 93 mg/kg, LC50 Inhalation (rat): 0.071 mg/L/4h
Sensitization: Can provoke allergic reactions of the skin and respiratory tract
Other Data: Hexavalent chromium compounds are classified as carcinogenic to humans (IARC Group 1)
Toxicity to Aquatic Life: Extremely toxic, LC50 (fish): approx. 0.2 mg/L (96h), toxic to crustaceans, algae, and higher aquatic plants at very low concentrations
Persistence and Degradability: Not readily degraded, chromium VI remains in the environment for long periods
Bioaccumulative Potential: Bioaccumulation likely in aquatic organisms; chromium taken up in biological systems
Mobility in Soil: High solubility increases mobility; chromium VI can penetrate and contaminate groundwater
Other Adverse Effects: Environmental releases result in ecosystem harm, risk of drinking water contamination, regulatory controls strict
Waste Handling: Chemical and contaminated packaging count as hazardous, require management as per local/national guidelines
Disposal Methods: Incineration in specialized chemical waste facilities capable of controlling chromium emissions, forbidden to discharge unneutralized residue in drains or surface water
Container Disposal: Decontaminate, puncture and dispose with approval from authorities
Regulatory Disposal: All waste classified as hazardous by EPA regulations under RCRA (D007 for chromium compounds)
UN Number: UN 1439
UN Proper Shipping Name: Ammonium Dichromate
Transport Hazard Class: 5.1 (Oxidizer), 6.1 (Toxic substances)
Packing Group: II
Label: Oxidizer, Toxic
Special Precautions: Handle in accordance with national and international transport regulations, emergency documentation, segregate from organic materials, acids, and combustibles during transit
TSCA (US): Listed
OSHA HazCom: Recognized as hazardous, subject to workplace hazard communication
SARA Title III: Subject as an Extremely Hazardous Substance, chronic health hazard, and environmental hazard
Right-to-Know (US States): Ammonium dichromate features on state hazardous chemical lists
ECHA/REACH (EU): Substance of Very High Concern, subject to authorization and restriction
Canada WHMIS: Class C (Oxidizing material), Class D1A (Immediate/serious toxic effects), Class D2A (Other toxic effects), Class E (Corrosive material)
Other Regulations: Strict reporting required for spills/releases, workplace air monitoring, and waste tracking
