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Product Name: Potassium Dichromate
Synonyms: Dichromic acid, dipotassium salt; Chromium potassium oxide
CAS Number: 7778-50-9
Recommended Use: Laboratory reagent, manufacture of chemicals, tanning leather, photography, wood staining
Supplier Info: Chemical supply company or laboratory reagent vendor
Emergency Contact: National emergency number or local poison control center
Hazard Class: Oxidizing solid, acute toxicity (oral, dermal, inhalation), carcinogenicity, mutagenicity, reprotoxic
GHS Label Elements: Danger pictogram (skull and crossbones, health hazard, exclamation mark, environment, oxidizer)
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage. May cause allergy or asthma symptoms or breathing difficulties. May cause cancer. Suspected of damaging fertility or the unborn child. Causes damage to organs through prolonged or repeated exposure. Very toxic to aquatic life with long lasting effects. Harmful if swallowed or inhaled.
Precautionary Statements: Avoid all contact with skin, eyes, and clothing. Do not breathe dust or fumes. Use only outdoors or in a well-ventilated area. Avoid release to the environment.
Chemical Name: Potassium Dichromate
Common Name: Potassium Dichromate
Concentration: 98-100%
Other Ingredients: None
Eye Contact: Rinse immediately with plenty of water for at least 15 minutes, keeping eyelids open. Remove contact lenses if present and easy to do. Seek immediate medical help.
Skin Contact: Take off contaminated clothing right away. Wash skin thoroughly with soap and water for at least 15 minutes. Get medical attention. Wash contaminated clothing before reuse.
Inhalation: Move the exposed person to fresh air. Keep at rest in a position comfortable for breathing. Call a doctor or poison center right away.
Ingestion: Rinse mouth with water. Do not induce vomiting. Never give anything by mouth to an unconscious person. Seek medical advice right away.
Most Important Symptoms: Burns, severe irritation, shortness of breath, coughing, rash, possible lung damage, symptoms may be delayed
Suitable Extinguishing Media: Dry chemical, carbon dioxide, foam, large quantities of water for larger fires
Unsuitable Extinguishing Media: Never use dry combustible materials (potassium dichromate is a strong oxidizer and can react violently)
Specific Hazards: Intensifies fire due to oxidizing properties. Toxic chromium fumes produced in fire. Explosive mixtures with organic material.
Protective Equipment: Self-contained breathing apparatus and full protective gear.
Advice for Firefighters: Cool containers with flooding quantities of water until well after fire is out
Personal Precautions: Evacuate unprotected personnel. Wear chemical splash goggles, gloves, self-contained breathing apparatus, chemical-resistant clothing. Avoid breathing dust.
Environmental Precautions: Prevent entry into sewers, surface or groundwater. Notify authorities if material reaches public waterways.
Containment and Cleanup: Sweep up dry spills carefully, avoid dust formation. Place in properly labeled container for safe disposal. Wash spill site with water and detergent after pickup is complete. Clean contaminated area thoroughly.
Additional Advice: Do not touch contaminated surfaces directly, use tools or disposable equipment for cleanup
Handling: Use in chemical fume hood. Minimize dust generation and accumulation. Do not get on skin, clothing, or in eyes. Avoid breathing dust. Keep away from heat and all sources of ignition. Do not eat, drink, or smoke in work area.
Storage: Keep container tightly closed in a cool, dry, well-ventilated, locked cabinet. Store away from incompatible materials like strong acids, organic materials, reducing agents, and combustibles. Protect from physical damage, moisture, and direct sunlight. Label all containers clearly.
Occupational Exposure Limits: OSHA PEL (TWA): 0.005 mg/m3 (as Cr(VI)); ACGIH TLV: 0.05 mg/m3 (as Cr(VI))
Engineering Controls: Chemical fume hood, local exhaust ventilation, emergency eyewash, and safety shower.
Personal Protective Equipment: Chemical splash goggles, face shield, lab coat or coveralls, impervious gloves, approved respirator (if exposure limits exceeded or if dust generation cannot be controlled)
Hygiene Measures: Wash hands and face after handling. Remove and wash contaminated clothing before reuse. Do not consume food or beverages in working area.
Appearance: Orange-red crystalline solid
Odor: Odorless
pH: Not applicable (solid); aqueous solutions are acidic
Melting Point: Decomposes at 398°C
Boiling Point: Decomposes
Solubility: Soluble in water
Density: 2.68 g/cm³
Vapor Density: Not applicable
Vapor Pressure: Not applicable
Evaporation Rate: Not applicable
Other Properties: Strong oxidizing agent, hygroscopic
Chemical Stability: Stable under normal conditions, sensitive to heat, light, and moisture
Reactivity: Reacts violently with reducing agents, organic materials, strong acids, alcohols, sulfur, and finely divided metals
Hazardous Reactions: Explosion hazard on contact with organic or combustible substances
Hazardous Decomposition: Toxic fumes of chromium oxides and potassium compounds
Routes of Exposure: Inhalation, skin contact, ingestion, eye contact
Acute Toxic Effects: Severe burns of skin and eyes, difficulty breathing, abdominal pain, vomiting, shock, death with high doses
Chronic Effects: Respiratory sensitizer, asthma, skin sensitization, ulcers, kidney and liver damage, nasal septum perforation, cancer (recognized human carcinogen by IARC, NTP, OSHA)
LD50 (Oral/Rat): 25 mg/kg; LD50 (Dermal/Rabbit): 200 mg/kg
Symptoms of Exposure: Sore throat, cough, redness, burning sensation, severe eye damage, skin discoloration or rash, delayed lung effects
Ecotoxicity: Extremely toxic to aquatic organisms and plants; long-term adverse effects in aquatic environment
Persistence and Degradability: Chromium (VI) compounds are persistent in environment, very slow to degrade
Bioaccumulation: Bioaccumulates in aquatic organisms, passes through food chain
Mobility in Soil: Highly mobile in water; potential to contaminate groundwater
Other Adverse Effects: Severe risk to wildlife, risk of mutagenicity and biomagnification
Disposal Methods: Dispose of waste according to local, regional, and national regulations. Do not allow material to reach sewage systems or water bodies. Send contaminated packaging, cleanup materials, and residues to permitted hazardous chemical waste disposal facilities.
Special Precautions: Neutralize with reducing agent and lime under controlled conditions for hexavalent chromium reduction before disposal, only by trained professionals. Keep records of chemical disposal.
UN Number: UN 3288
Proper Shipping Name: Toxic solid, inorganic, n.o.s. (Potassium dichromate)
Transport Hazard Class: 6.1 (Toxic substances), 5.1 (Oxidizer)
Packing Group: II
Environmental Hazards: Marine pollutant
Special Transport Precautions: Avoid contact with incompatible substances. Secure containers. Follow all international and national transport regulations.
OSHA Status: Classified as hazardous by OSHA under 29 CFR 1910.1200
EPA: Listed as hazardous waste (RCRA D007); subject to SARA Title III (313); subject to CERCLA reporting
TSCA: Potassium dichromate is listed on the TSCA inventory
Other Regulations: Subject to the European REACH regulations; classified as carcinogenic, mutagenic, and reprotoxic substance (CMR) in the EU
WHMIS (Canada): Class D1A (very toxic), D2A (carcinogen), D2B (sensitizer), C (oxidizing material)
California Prop 65: Listed for cancer and reproductive toxicity
