Product Name: Hydroquinone Monomethyl Ether
Synonyms: 4-Methoxyphenol, p-Methoxyphenol
CAS Number: 150-76-5
Recommended Use: Polymerization inhibitor, antioxidant, photographic chemical
Supplier: [Supplier Name and Address]
Emergency Telephone: [Emergency Phone Number]
Email for MSDS Requests: [Email Address]
Classification: Acute toxicity (Oral, Category 4), Eye irritation (Category 2A), Skin irritation (Category 2), Specific target organ toxicity—single exposure (Category 3, narcotic effects)
Signal Word: Warning
Hazard Statements: Harmful if swallowed. Causes skin and eye irritation. May cause respiratory irritation.
Pictograms: Exclamation mark
Precautionary Statements: Avoid breathing dust/vapors. Wash hands thoroughly after handling. Wear protective gloves/eye protection. If inhaled, remove person to fresh air. If in eyes, rinse with water.
Chemical Name: Hydroquinone Monomethyl Ether
CAS Number: 150-76-5
EC Number: 205-769-8
Concentration: ≥99% by weight
Impurities: Trace hydroquinone, methanol, water (less than 1%)
Inhalation: Move person to fresh air. Seek medical attention if symptoms appear. Provide artificial respiration if not breathing.
Skin Contact: Remove contaminated clothing. Rinse skin with plenty of soap and water. Seek medical attention for persistent irritation.
Eye Contact: Rinse eyes immediately with large amounts of water for at least 15 minutes. Get medical advice.
Ingestion: Rinse mouth. Do not induce vomiting. Seek immediate medical advice. Give water if person is conscious.
Suitable Extinguishing Media: Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide.
Special Hazards: Toxic fumes of carbon monoxide, carbon dioxide, and unidentified organic compounds may form.
Protective Equipment: Firefighters require self-contained breathing apparatus and protective clothing.
Advice for Firefighters: Avoid inhaling combustion products. Cool adjacent containers with water spray.
Personal Protection: Use protective equipment including gloves and goggles. Avoid skin and eye contact.
Environmental Precautions: Prevent further leakage or spillage if it can be done safely. Do not allow product to reach soil, sewers, or water sources.
Spill Response: Ventilate area. Absorb with inert material such as sand, earth, or vermiculite. Place collected material in labeled containers. Wash spill site after material pickup is complete.
Handling: Use with adequate ventilation. Avoid exposure by inhalation, skin, or eyes. Do not use near flames or sources of ignition.
Storage: Keep container tightly closed in a cool, dry, well-ventilated place away from incompatible materials such as oxidizers. Store in original sealed packaging. Protect from light and moisture. Avoid prolonged storage at elevated temperatures to prevent decomposition.
Exposure Limits: No OSHA PEL (Permissible Exposure Limit) or ACGIH TLV (Threshold Limit Value) established.
Engineering Controls: Ensure adequate general and local exhaust ventilation.
Personal Protective Equipment: Safety glasses with side shields, chemical-resistant gloves (nitrile or neoprene), impermeable clothing. Appropriate respiratory protection required for air concentrations above recommended exposure levels.
Hygiene Measures: Do not eat, drink, or smoke while handling. Wash hands before breaks and after use.
Appearance: White to off-white crystalline solid
Odor: Faint, phenolic odor
Odor Threshold: No data available
pH: 6.0–7.0 (0.1% solution)
Melting Point/Freezing Point: 54–57°C
Boiling Point: 243–245°C
Flash Point: 129°C (closed cup)
Evaporation Rate: No data available
Flammability: Not highly flammable
Vapor Pressure: <0.01 mmHg at 25°C
Vapor Density: 4.1 (air = 1)
Relative Density: 1.09 g/cm³
Solubility: Slightly soluble in water, easily soluble in alcohol, ether, benzene
Partition Coefficient (Log Kow): 1.60
Auto-Ignition Temperature: 530°C
Decomposition Temperature: Not specified
Viscosity: No data available
Chemical Stability: Product remains stable under recommended storage conditions.
Reactivity: May react with strong oxidizing agents, acids, alkalis.
Hazardous Reactions: Contact with oxidizers can produce heat and hazardous gases.
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, and organic vapors upon combustion.
Conditions to Avoid: Excess heat, sunlight, incompatible materials, open flame, moisture.
Acute Toxicity: Oral LD50 in rats is approximately 1600 mg/kg.
Skin Corrosion/Irritation: Can cause skin irritation after prolonged or repeated contact.
Eye Damage/Irritation: May cause severe eye irritation.
Respiratory Effects: Inhalation may cause respiratory tract irritation leading to coughing, shortness of breath.
Sensitization: No animal data available for sensitization.
Chronic Effects: No strong evidence for carcinogenicity or reproductive effects. Prolonged exposure can lead to skin discoloration.
Other Effects: Possible impairment of central nervous system if ingested in large quantities.
Toxicity: Toxic to aquatic organisms. Fish LC50 (96h): 34 mg/L (Oncorhynchus mykiss).
Persistence and Degradability: Expected to readily degrade in the environment by microbial action.
Bioaccumulative Potential: Low bioaccumulation potential based on log Kow.
Mobility in Soil: Highly mobile in moist soil but binds to organic matter.
Other Adverse Effects: Avoid release to the environment. Product can cause oxygen depletion in water systems, affecting aquatic life.
Disposal Methods: Dispose of as chemical waste in accordance with local, regional, and national regulations. Do not discharge to drains or the environment.
Container Disposal: Triple-rinse containers before disposal. Remove labeling before recycling or landfilling.
Special Precautions: Seek assistance from licensed chemical waste disposal companies or local government waste authorities.
UN Number: Not classified as a hazardous material for transportation
Proper Shipping Name: Hydroquinone Monomethyl Ether
Transport Hazard Class: Not regulated
Packing Group: Not applicable
Environmental Hazards: Not a marine pollutant
Special Precautions: Transport capped containers upright. Avoid direct contact or mixing with incompatible substances.
OSHA Status: Not specifically listed as hazardous
TSCA (Toxic Substances Control Act): Listed
REACH Status (EU): Registered;
SARA Title III: Not listed under Section 313
California Proposition 65: Not listed
Other Regulations: Product falls under workplace safety reporting and labeling laws in many regions; consult local rules before use.
Labeling Requirements: Signal word, hazard pictogram, and precautionary statements as outlined above.
