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Product Name: Zinc Dichromate
CAS Number: 13630-65-0
Chemical Formula: ZnCr2O7
Synonyms: Zinc chromate(VI), Zinc bichromate
Recommended Uses: Corrosion inhibitor, pigment in paints, protective coatings, metal treatment
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Emergency Overview: Yellow powder, strong oxidizer, toxic, suspected carcinogen, known to cause health hazards on exposure, avoid contact.
Classification: Acute Toxicity (Oral Category 3), Acute Toxicity (Dermal Category 3), Carcinogenicity (Category 1B), Specific Target Organ Toxicity — Repeated Exposure (Category 2), Eye Damage/Irritation (Category 1), Sensitization (Skin Category 1), Aquatic Toxicity (Acute/Chronic Category 1)
GHS Label Elements: Hazard Pictograms (Skull and crossbones, Corrosive, Health hazard, Environment), Signal Word: Danger
Hazard Statements: Toxic if swallowed or in contact with skin, May cause cancer, Causes serious eye damage, Causes skin sensitization, May damage organs through prolonged or repeated exposure, Very toxic to aquatic life with long lasting effects
Precautionary Statements: Avoid breathing dust, wear protective gloves and eye protection, wash exposed skin thoroughly, avoid release to the environment, store locked up, dispose of contents/container in accordance with regulations.
Chemical Identity: Zinc dichromate
Concentration: 100%
CAS Number: 13630-65-0
Chromium (VI) Content: Significant, represents major toxic concern
Impurities: Traces of other metal chromates, may contain industrial residues
Inhalation: Remove to fresh air immediately, supply oxygen if breathing is difficult, keep victim warm and at rest, get medical attention without delay.
Skin Contact: Remove contaminated clothing, rinse skin with plenty of water for at least 15 minutes, call for medical help.
Eye Contact: Rinse cautiously with water for at least 15 minutes keeping eyelids open, remove contact lenses if present, continue rinsing, get immediate medical advice.
Ingestion: Rinse mouth with water, never give anything by mouth if unconscious, do not induce vomiting, seek medical attention urgently.
Important Symptoms: Burning sensation, cough, shortness of breath, skin/redness, ulceration, severe eye irritation, possible delayed effects on kidneys and liver.
Medical Attention: Obtain urgent medical help, monitor for delayed symptoms including kidney and liver impact.
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide for surrounding fire, avoid contact of chemical with water except in firefighting due to reactivity.
Special Hazards: Strong oxidizer, can intensify fire, generates toxic chromium oxides on decomposition, may react violently with reducing agents.
Protective Equipment: Wear full protective gear, including self-contained breathing apparatus, prevent runoff, isolate area.
Advice for Firefighters: Approach from upwind to avoid hazardous fumes, avoid inhaling combustion gases.
Personal Precautions: Evacuate uninvolved personnel, wear chemical-resistant gloves and safety goggles, use respiratory protection if dust is generated.
Environmental Precautions: Prevent entry into wells, sewers, or surface water. Notify authorities if contamination occurs.
Containment and Clean-Up Methods: Avoid raising dust, scoop up mechanically, place in suitable tight container, wash spill area with water, collect contaminated water for disposal, ventilate area.
Safe Handling: Handle in controlled, well-ventilated area, avoid creating dust or aerosol, never eat, drink, or smoke while working with the substance, use local exhaust.
Storage Requirements: Store in a cool, dry, well-ventilated place separate from incompatible materials such as acids and reducing agents, keep container tightly closed, store locked up.
Special Considerations: Regularly inspect containers for damage or leaks, use corrosion-resistant containers, post hazard warning signs in areas of use and storage.
Control Limits: OSHA PEL (as Cr(VI)): 0.005 mg/m³ TWA, NIOSH REL: 0.001 mg/m³
Engineering Controls: Use closed process, local exhaust ventilation, provide safety showers and eyewash stations nearby.
Personal Protective Equipment (PPE): Chemical-resistant gloves (nitrile or butyl), full-cover protective clothing, safety goggles, face shield if risk of splashes, approved respirator for dust/fumes, proper foot protection.
Hygiene Measures: Wash hands before breaks and after work, decontaminate protective equipment regularly, do not bring contaminated clothing home.
Appearance: Yellow to greenish-yellow crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
pH: Not available
Melting Point/Freezing Point: Decomposes before melting, decomposition at 281°C
Boiling Point: Not applicable
Flash Point: Not flammable
Evaporation Rate: Not volatile
Flammability: Not combustible but strong oxidizer
Vapor Pressure: Not applicable
Vapor Density: Not applicable
Solubility: Slightly soluble in water
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: Not auto-ignitable
Decomposition Temperature: 281°C (releases toxic fumes)
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage conditions, decomposes violently at high temperatures
Reactivity Profile: Strong oxidizing agent, can react with organic materials, combustibles, reducing agents, sometimes violently
Hazardous Reactions: Intense reactions with acids, release of toxic gases
Conditions to Avoid: High temperatures, incompatible chemicals
Incompatible Materials: Acids, reducing agents, peroxides, organic materials
Hazardous Decomposition Products: Chromium oxides, zinc oxides, and potentially other toxic metal fumes
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Oral (rat) LD50: 82 mg/kg; Dermal (rabbit) LD50: 85 mg/kg; Inhalation: Data limited, considered highly toxic
Chronic Effects: Prolonged exposure can cause kidney, liver, and respiratory system damage, carcinogenic to humans (IARC Group 1)
Symptoms: Eye burns, skin ulcers, respiratory distress, persistent cough, possible allergic reactions, severe abdominal pain on ingestion
Carcinogenicity: Chromium(VI) compounds classified as known human carcinogens
Mutagenicity: Evidence from animal studies demonstrates mutagenic potential
Reproductive Toxicity: Some evidence of reproductive toxicity in animal studies, chromium(VI) compounds noted for such risks
Target Organs: Lungs, skin, kidneys, liver, respiratory tract, eyes
Ecotoxicity: Highly toxic to aquatic life even at low concentrations, bioaccumulates in aquatic organisms, causes long-term adverse ecosystem effects
Persistence and Degradability: Expected to persist in environment, chromium(VI) resistant to breakdown, persists in soils and sediments
Bioaccumulation Potential: Accumulates in fish and aquatic plants, enters food chain
Mobility in Soil: Chromium(VI) is mobile and can reach groundwater
Other Adverse Effects: Toxic to plants and microbes, disrupts soil and water environments, strict management needed to prevent environmental spills.
Waste Treatment Methods: Must dispose as hazardous waste according to local, regional, and national regulations, do not dump in sewers or natural bodies of water
Disposal Containers: Use original or dedicated sealed containers, label as hazardous
Hazardous Waste Codes: U032, D007 for chromium-containing wastes
Recommendation: Engage licensed hazardous waste disposal contractor, neutralize only if specifically permitted and trained.
UN Number: 3288
Proper Shipping Name: Toxic Solid, Inorganic, N.O.S. (contains Zinc Dichromate, Chromium(VI))
Transport Hazard Class: 6.1 (Toxic Substances), also classified for environmental hazard
Packing Group: II (medium danger)
Environmental Hazard: Marine pollutant
Special Transport Precautions: Ensure packaging prevents release or leakage during transit, carriers must be informed of risks, emergency response guidance available.
OSHA: Regulated for worker exposure, strict permissible exposure limits, Hazard Communication Standard applies
TSCA: Listed substance, reporting required
SARA 302/304: Listed as extremely hazardous, reporting thresholds apply
SARA 313: Subject to toxic chemical release reporting
RCRA: Listed hazardous waste due to chromium(VI) content
EU REACH: Subject to restrictions due to chromate toxicity, authorizations required
WHMIS (Canada): Classified as toxic, carcinogenic, environmental hazard
Other International: Many countries restrict use under carcinogen and environmental legislations.
