Product Name: Benzohydroquinone
Synonyms: 1,4-Dihydroxybenzene, Hydroquinone, Devoxol
CAS Number: 123-31-9
Recommended Uses: Used in photography, skin depigmentation, hair dyes, laboratory reagent, polymerization inhibitor
Supplier Information: Name, full address, emergency phone number
Manufacturer Information: Name, full address, emergency phone number
Chemical Formula: C6H6O2
Molecular Weight: 110.11 g/mol
Classification: Acute Toxicity (Oral Category 4), Skin Irritation (Category 2), Eye Irritation (Category 2A), Germ Cell Mutagenicity (Category 2), Carcinogenicity (Category 2), Specific Target Organ Toxicity (Repeated Exposure Category 2)
Signal Word: Warning
Hazard Statements: Harmful if swallowed. Causes skin and serious eye irritation. Suspected of causing genetic defects. Suspected of causing cancer. May cause damage to organs through prolonged or repeated exposure.
Precautionary Statements: Avoid breathing dust. Wash exposed skin thoroughly after handling. Avoid contact with eyes, skin, and clothing. Wear protective gloves, eye and face protection.
Physical Hazards: Dust may form explosive mixtures with air.
Health Hazards: May cause allergic skin reaction; overexposure through inhalation or absorption may affect liver and kidneys.
Environmental Hazards: Toxic to aquatic life with long-lasting effects.
Chemical Name: Benzohydroquinone
CAS Number: 123-31-9
Concentration: 99-100%
Impurities/Additives: Trace phenolic compounds below 1%
Inhalation: Move to fresh air. Supply oxygen if breathing is difficult. Seek immediate medical attention for persistent symptoms.
Skin Contact: Remove contaminated clothing. Rinse skin with soap and running water for at least 15 minutes. Seek medical help if irritation persists.
Eye Contact: Flush eyes with plenty of clean water for 15 minutes. Lift upper and lower eyelids occasionally. Get prompt medical attention.
Ingestion: Rinse mouth with water if the person is conscious. Do not induce vomiting. Seek urgent medical care.
Most Important Symptoms: Burns, irritation, headache, dizziness, vomiting, abdominal pain; risk of delayed effects on kidney and liver.
Note to Physicians: Treat symptomatically. Consider observation for renal and hepatic complications.
Suitable Extinguishing Media: Water spray, dry chemical, alcohol-resistant foam, carbon dioxide
Unsuitable Extinguishing Media: Direct water jet
Specific Hazards: May emit toxic fumes of carbon monoxide, carbon dioxide under fire; dust-air mixtures can be explosive
Protective Equipment: Full protective gear, self-contained breathing apparatus
Special Procedures: Remove unaffected containers from fire area if safe. Use water spray to cool fire-exposed containers.
Personal Precautions: Wear chemical resistant gloves, goggles, and suitable protective clothing to avoid skin or eye contact.
Emergency Procedures: Evacuate unnecessary personnel, provide adequate ventilation. Avoid breathing dust.
Environmental Precautions: Prevent release into water bodies, drains or soil.
Clean-up Methods: Use non-sparking tools to sweep up and place residue in chemical waste container. Wash spill site with plenty of water after cleanup.
Safe Handling: Use only in well-ventilated areas. Avoid formation of airborne dust. Keep away from heat and ignition sources. Use non-sparking equipment.
Safe Storage: Store in tightly closed containers, in a cool, dry, well-ventilated area. Separate from oxidizers, acids, and foodstuffs.
Incompatible Materials: Strong oxidizing agents, nitric acid, chromates, mineral acids.
Storage Class: Hazardous material, organic solid.
Exposure Limits: ACGIH TLV (TWA) 2 mg/m3 (inhalable fraction and vapor). OSHA PEL 2 mg/m3.
Engineering Controls: Use local exhaust or general dilution ventilation.
Eye Protection: Safety goggles or face shield.
Skin Protection: Chemical-resistant gloves (nitrile or neoprene), long sleeves, lab coat.
Respiratory Protection: Use NIOSH-approved respirator if dust exceeds permitted levels.
Hygiene Measures: Wash hands before eating, drinking, or smoking. Remove contaminated clothing before leaving work area.
Appearance: White to off-white crystalline solid
Odor: Faint, phenolic
Odor Threshold: Not available
pH: 5.5 (saturated solution)
Melting Point: 172°C
Boiling Point: 285°C
Flash Point: 165°C (closed cup)
Evaporation Rate: Not applicable
Flammability: May form combustible dust concentrations in air
Upper/Lower Explosive Limits: Not established
Vapor Pressure: 6.6 x 10-5 mmHg (25°C)
Vapor Density: Not available
Relative Density: 1.32 g/cm3
Solubility in Water: 7 g/100 mL (20°C)
Solubility (Other Solvents): Soluble in alcohol, ether, acetone
Partition Coefficient (n-octanol/water): 0.59 log Kow
Auto-ignition Temperature: 515°C
Decomposition Temperature: >172°C
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage conditions
Possibility of Hazardous Reactions: Violent reaction with strong oxidizers
Conditions to Avoid: Heat, sparks, static electricity, open flames, moisture
Incompatible Materials: Strong oxidizing agents, strong acids, alkalis, oxidizing metals
Decomposition Products: Releases carbon oxides, additional toxic vapors on decomposition
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Acute Toxicity: Oral LD50 (rat): 320 mg/kg
Skin Irritation: Causes moderate skin irritation, burns on prolonged contact
Eye Effects: Serious eye irritation, may cause permanent injury
Sensitization: May cause allergic skin reaction
Repeated Dose Toxicity: Prolonged exposure impairs kidney and liver function; methemoglobinemia has been observed
Mutagenicity: Suspected based on animal studies
Carcinogenicity: IARC: Group 3 (not classifiable as to its carcinogenicity to humans); US EPA: Suspected human carcinogen
Reproductive Toxicity: No evidence of reproductive toxicity in animal studies under normal exposure levels
Target Organs: Kidneys, liver, blood
Toxicity: Highly toxic to aquatic life (LC50 0.044-0.13 mg/L for fish 96h)
Persistence and Degradability: Readily biodegradable under aerobic conditions in soil and water
Bioaccumulative Potential: Low, log Kow 0.59
Mobility in Soil: High, due to good water solubility
Other Adverse Effects: May cause toxicity to aquatic organisms even at low concentrations
Waste Disposal Methods: Collect and dispose of material at permitted hazardous landfill in compliance with local, regional, and national regulations. Incineration at high temperature is recommended for larger quantities.
Contaminated Packaging: Rinse containers thoroughly before recycling or disposal as hazardous waste.
Special Precautions: Do not dispose to the environment or water bodies.
UN Number: 3077
UN Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (Hydroquinone)
Transport Hazard Class: 9 (Miscellaneous dangerous substances)
Packing Group: III
Environmental Hazards: Marine pollutant
Special Transport Precautions: Keep away from food and feedstuffs, ensure packaging is robust and intact; placards and labeling as per international and regional guidelines
Workplace Safety: Listed under OSHA hazardous chemicals. Covered by the U.S. EPCRA Section 313 toxic chemicals list.
Inventory Status: Listed on TSCA, EINECS/ELINCS, AICS, DSL, and KECI chemical inventories
Labelling Requirements (GHS): Signal word: Warning, hazard pictograms (Exclamation mark, Health hazard, Environment)
Risk Phrases: R22 (Harmful if swallowed), R40 (Limited evidence of carcinogenic effect), R43 (May cause sensitization by skin contact)
Safety Phrases: S24 (Avoid contact with skin), S36/37 (Wear suitable protective clothing and gloves), S61 (Avoid release to the environment)
