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Product Name: Silver Dichromate
Chemical Formula: Ag2Cr2O7
CAS Number: 7784-41-0
Synonyms: Dichromic acid, disilver(1+) salt
Recommended Use: Analytical reagent, laboratory chemical, occasional oxidizing agent
Manufacturer Information: Chemical supplier contact details, including address, phone number, and emergency contact number, should always feature on the official SDS distributed by producers, given the regulatory requirements in different regions.
GHS Classification: Oxidizing solid (Category 2), Acute toxicity – oral (Category 3), Acute toxicity – inhalation (Category 2), Skin corrosion/irritation (Category 1B), Serious eye damage/irritation (Category 1), Carcinogenicity (Category 1B), Specific target organ toxicity – repeated exposure (Category 2), Hazardous to aquatic environment (acute and chronic, Category 1).
Hazard Statements: Strong oxidizer; intensifies fire; toxic if swallowed or inhaled; causes severe burns to skin and eyes; known to cause cancer via inhalation/exposure; causes damage to organs after prolonged or repeated exposure; highly toxic to aquatic organisms with long-lasting effects.
Signal Word: Danger
Pictograms: Flame over circle, Skull and crossbones, Corrosion, Health hazard, Environment
Chemical Name: Silver Dichromate
Concentration: 100%
CAS Number: 7784-41-0
Impurities/Stabilisers: High grade laboratory preparations should contain minimal impurities, but users must always reference the batch’s Certificate of Analysis for trace contaminants (could include silver oxides, other dichromates, or unreacted silver salts).
Inhalation: Move affected person to fresh air promptly. If breathing is difficult, oxygen may support recovery but professional medical attention is urgent due to the risk of delayed lung injury or chromium-induced respiratory effects.
Ingestion: Do not induce vomiting. Rinse mouth thoroughly with plenty of water; administer water if the injured person is conscious. Immediate medical intervention is vital, as dichromates can cause severe gastrointestinal burns and systemic toxicity.
Skin Contact: Remove contaminated clothing and rinse the skin thoroughly under running water for at least 20 minutes. Seek prompt medical attention because skin absorption can result in systemic toxicity and chemical burns.
Eye Contact: Flush eyes with running water for at least 30 minutes while lifting eyelids occasionally. Immediate hospital evaluation is warranted as tissue damage can progress rapidly.
Most Critical Symptoms/Effects: Severe skin and eye irritation, chemical burns, delayed lung injury, gastrointestinal corrosion, renal failure, carcinogenic risk. Immediate antidotes do not exist; supportive management is essential.
Suitable Fire Extinguishing Media: Use dry sand, dry chemical powder, or special foam for suppressing adjacent combustible material. Do not attempt to extinguish with water or CO2, as dichromate’s oxidizing nature can intensify flames.
Special Hazards: Powerful oxidizer; increases burning rate of combustibles; risk of toxic chromium oxide and silver fume generation in a fire. Reacts with organic material and reducing agents.
Precautions for Firefighters: Full protective clothing and a self-contained breathing apparatus required. Evacuate non-essential personnel. Stay upwind to avoid fumes.
Decomposition Products: Chromium trioxide, silver fumes, oxygen.
Personal Precautions: Restrict unnecessary entry into the area. Don personal protective equipment: chemical-resistant gloves, Class 7 chemical suits, eye protection, and respiratory protection (at minimum a P3 filter).
Environmental Precautions: Prevent spillage from entering drains, soil, or water systems. Notify government environmental or water pollution authorities in case of a significant spill.
Cleanup Methods: Absorb spills using inert, non-combustible material such as vermiculite, sand, or earth. Shovel waste into clearly labelled, tightly sealed containers. Dispose in accordance with regulatory guidelines. Avoid combustible material contact.
Handling: Handle in certified fume hoods or local exhaust ventilation. Do not let the product contact skin, eyes, or clothing. Don’t breathe dust or vapors. Use non-sparking tools. Store separately from acids, bases, reducing agents, organics, and combustibles.
Storage: Keep tightly closed in original packaging. Store in cool, dry, well-ventilated, dedicated oxidizer storage areas. Preferably use corrosion-resistant shelving. Precise inventory tracking and tamper-evident controls recommend a vigilant safety culture.
Workplace Exposure Limits: OSHA Chromium(VI): 0.005 mg/m3 TWA; ACGIH Silver Inorganic Compounds: 0.01 mg/m3 TWA.
Engineering Controls: Use fume hoods, glove boxes, or closed process systems. Emergency eyewash and safety shower stations nearby are critical.
Personal Protective Equipment: Gloves: nitrile, neoprene, or butyl rubber. Eye/face: splash-proof goggles and face shields. Body: full-length lab coats/coveralls. Respiratory: At least P100 filters for dusts/mists—if not in containment system, use positive-pressure supplied air.
Appearance: Deep orange to red crystalline solid or powder
Odor: Odorless
Molecular Weight: 431.75 g/mol
Melting Point: Decomposes before melting
Solubility: Insoluble in water; decomposes
Density: Roughly 5.42 g/cm3 at 20°C
Vapor Pressure: Not applicable
pH: Not applicable in water, decomposes
Boiling Point: Decomposes
Other: Strong oxidizer; reacts vigorously with reducing agents and organic material.
Chemical Stability: Stable under recommended conditions. Prolonged exposure to moisture or incompatible substances elevates decomposition risk.
Reactive Substances: Reducing agents, combustibles, acids, organics, metals, sulfur compounds—violent or explosive reactions are possible.
Hazardous Decomposition Products: Chromium trioxide gas and finely divided silver, plus oxygen. Both chromium and silver may form toxic particles.
Special Conditions: Avoid physical shock, heat, friction, sparks.
Routes of Exposure: Inhalation, ingestion, skin, and eye contact.
Acute Toxicity: LD50 (oral, rat): less than 100 mg/kg. Inhalation at low concentrations produces rapid symptoms. Severe lung, kidney, liver effects within hours of exposure.
Chronic Effects: Carcinogenic to humans based on animal and occupational data. Long-term exposure can lead to chromate ulcers, kidney and liver dysfunction, respiratory sensitization, increased cancer risk (lung/nose/sinus).
Irritant Data: Causes severe skin and eye burns. Allergic skin reactions may take place.
Sensitization: Risk of allergic contact dermatitis.
Carcinogen Status: Chromium(VI) compounds classified as IARC Group 1 carcinogens. ACGIH A1 (confirmed human carcinogen).
Eco-toxicity: Very toxic to aquatic life. LC50 (fish, 96h): <1 mg/liter. Bioaccumulates in aquatic organisms; poses long-term hazards to benthic life.
Degradation and Persistence: Not readily biodegradable. Chromium(VI) ions persist and can migrate through soil and groundwater.
Mobility: High solubility of chromium ions after release; silver and chromium compounds accumulate in sediments and may remobilize during industry disruptions.
Further Hazards: Waterways must avoid exposure; stringent controls and remediation are standard in case of accidental releases.
Recommended Methods: Collect solid waste and heavily contaminated PPE in tightly sealed hazardous waste containers. Engage a licensed, permitted hazardous waste facility for safe disposal by incineration in a chemical waste combustor equipped with afterburner and scrubber.
Do Not: Do not dump in regular trash, drains, or sewers. Incompatible with landfill disposal.
Disposal Regulations: U.S. RCRA Hazardous Waste: D007 (chromium-containing waste), F007-F009 for specific industrial scenarios.
UN Number: 3288
Proper Shipping Name: Toxic solid, oxidizing, inorganic, n.o.s. (Silver Dichromate)
Transport Hazard Class: 6.1 (Toxic), 5.1 (Oxidizer)
Packing Group: II
Label Requirements: Toxic, Oxidizer
Special Precautions: Segregate from food or feedstuffs. Avoid exposure to moisture and ignition sources in transit. Secure containers to prevent tipping or spillage.
U.S. Regulation: TSCA-listed; subject to SARA Title III Section 313 reporting (chromium compounds). OSHA specifically regulates chromium(VI) exposure in workplaces.
Europe: REACH-registered. Subject to restrictions under Annex XVII (chromium VI compounds).
Canada: DSL-listed. Regulated under WHMIS as a Class D1A acute toxic and D2A carcinogenic by inhalation.
Other: IARC (Group 1 Carcinogen), NTP (Reasonably anticipated carcinogen), ACGIH (A1: Confirmed human carcinogen, as Cr(VI) compounds).
Global GHS: Labeled for severe health and aquatic hazards, with mandatory risk and safety phrases for occupational settings.
