Product Name: Methylhydroquinone
Chemical Name: 4-Methyl-1,2-benzenediol
Synonyms: 4-Methylhydroquinone, 4-Methylresorcinol
CAS Number: 150-76-5
Recommended Use: Research and manufacturing, chemical synthesis
Manufacturer/Supplier: Information specific to local supplier
Emergency Phone Number: Refer to local regulations for appropriate contact
Classification: Harmful if swallowed or inhaled, causes skin and serious eye irritation, may cause allergic skin reaction
GHS Label Elements: Signal word: Warning; Hazard pictograms: Exclamation mark, Health hazard
Hazard Statements: Harmful if swallowed, causes skin and eye irritation, may cause allergic skin reactions, may cause respiratory irritation
Precautionary Statements: Avoid breathing dust/fume, wash skin thoroughly after handling, wear protective gloves and clothing, avoid release to the environment, if on skin: wash with plenty of soap and water, immediately remove contaminated clothing
Chemical Name: Methylhydroquinone
Concentration: ≥99%
CAS Number: 150-76-5
Molecular Formula: C7H8O2
Impurities: Trace level process-related impurities, details available from supplier
Inhalation: Remove person to fresh air, keep at rest, obtain medical attention if symptoms occur
Skin Contact: Remove contaminated clothing, wash affected area with soap and water, seek medical attention for persistent symptoms
Eye Contact: Immediately rinse with water for at least 15 minutes, seek medical care if irritation persists
Ingestion: Rinse mouth, do not induce vomiting, get medical advice as soon as possible
Most Important Symptoms: Irritation, redness, allergic reactions, respiratory discomfort in sensitive individuals
Extinguishing Media: Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide
Hazards from Combustion: Toxic fumes such as carbon monoxide and carbon dioxide may form
Specific Protective Equipment: Firefighters should wear self-contained breathing apparatus, protective clothing
Fire or Explosion Hazards: Dust may form explosive mixtures with air, avoid generating dust clouds
Personal Precautions: Evacuate area, use personal protective equipment, avoid breathing dust
Environmental Precautions: Prevent product from entering waterways, drains, or sewers
Methods for Cleaning Up: Collect spilled material with inert absorbent, place in suitable closed containers, ventilate area, wash spill site after cleanup
Handling: Use only in well-ventilated areas, avoid generating dust, minimize contact with skin, eyes, and clothing
Storage: Store in tightly closed containers, in a cool, dry, well-ventilated place, keep away from incompatible materials such as oxidizing agents
Incompatibilities: Strong oxidizers, acids, bases
Hygiene Practices: Wash hands after handling, do not eat, drink, or smoke in work area
Exposure Limits: No established occupational exposure limits for methylhydroquinone; use general dust exposure limits
Engineering Controls: Local exhaust ventilation, process enclosures
Personal Protective Equipment: Safety glasses or goggles, gloves resistant to chemicals, lab coat, adequate respiratory protection for dust
Environmental Controls: Effluent treatment to minimize release to environment
Appearance: White to light tan crystalline powder
Odor: Faint, phenolic odor
Melting Point: 169–173°C
Boiling Point: 285°C
Flash Point: 163°C
Solubility: Soluble in hot water and alcohol, slightly soluble in cold water
Density: 1.22 g/cm³
Vapor Pressure: Negligible at room temperature
Partition Coefficient: Log Kow 0.59
pH: Not available
Chemical Stability: Stable under normal storage and handling conditions
Reactivity: Not reactive under typical use
Possibility of Hazardous Reactions: May react with strong oxidizing agents or acids
Decomposition Products: Carbon monoxide, carbon dioxide, phenolic compounds
Conditions to Avoid: Heat, sparks, open flames, exposure to air and moisture
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: Oral LD50 (rat): 1600 mg/kg
Skin Sensitization: May cause allergic reactions on prolonged or repeated contact
Skin/Eye Irritation: Causes moderate skin and severe eye irritation
Chronic Effects: Repeated exposure may affect the liver and blood
Carcinogenicity: Not classified as carcinogenic by NTP, IARC, OSHA
Mutagenicity: No significant evidence in standard tests
Reproductive Toxicity: Data insufficient
Ecotoxicity: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Persistence and Degradability: Readily biodegradable in soil and water under aerobic conditions
Bioaccumulative Potential: Low, based on log Kow value
Mobility in Soil: Moderate, can leach if spilled in large quantities
Other Adverse Effects: Avoid product release to environment, risk of contamination to water and soil if handled improperly
Disposal Methods: Dispose of in accordance with local, regional, national, and international regulations
Packaging Disposal: Empty containers should be handled as chemical waste and disposed of accordingly
Precautions: Avoid release to drains, take measures to prevent environmental contamination
UN Number: Not regulated as dangerous goods for transport
Transport Hazard Class: Not classified
Packing Group: Not assigned
Proper Shipping Name: Methylhydroquinone
Special Precautions for User: Handle with care to prevent spillage or dust generation
Safety, Health and Environmental Regulations: Subject to chemical regulations under TSCA, REACH, and other local statutes
Inventory Listing: Listed in TSCA and EINECS/ELINCS inventories
Labeling Requirements: Hazard communication based on GHS, local workplace labeling may apply
Restrictions: Industrial use only
Other Information: Consult local authorities for additional regulatory requirements
