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Chemical Name: 3-Methylthiophene
Chemical Formula: C5H6S
Appearance: Clear, yellowish liquid with a strong, distinctive odor
Common Uses: Intermediate in organic synthesis, flavor and fragrance industries, research laboratories
CAS Number: 616-44-4
Health Hazards: Causes eye and skin irritation, inhalation may lead to respiratory discomfort or narcotic effects at high concentrations, ingestion can cause gastrointestinal discomfort and possible toxic response
Environmental Hazards: Harmful to aquatic life, spills may cause localized contamination
Fire Hazard: Highly flammable, vapors can form explosive mixtures with air, flash point is low, risk is higher in confined or poorly ventilated spaces
Warning Symbols: Flammable Liquid, Irritant
Main Ingredient: 3-Methylthiophene (pure compound or as the main component in most preparations)
Impurities: Typically contains small amounts of related thiophenes or unreacted starting materials from synthesis, depending on source
Inhalation: Move affected person to fresh air, offer oxygen if breathing is difficult, seek medical help when significant symptoms persist
Skin Contact: Wash with plenty of soap and water, remove contaminated clothing, medical advice recommended if irritation occurs
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present and safe to do so, continue rinsing, get medical attention if discomfort persists
Ingestion: Rinse mouth, never induce vomiting, medical supervision is crucial after intentional or accidental swallowing, risk assessment depends on amount
Suitable Extinguishing Media: Use foam, carbon dioxide, or dry chemical powder, water spray only to cool exposed containers
Special Hazards: Vapors are heavier than air and travel along ground to ignition sources, combustion releases sulfur oxides and other toxic fumes
Protective Equipment: Full protective suit and self-contained breathing apparatus for firefighters because smoke contains hazardous compounds
Firefighting Advice: Keep containers cool by spraying with water, evacuate area if risk of explosion, ventilate area thoroughly after extinguishing
Personal Precautions: Avoid inhalation of vapors, direct contact with skin or eyes, wear gloves, goggles, protective clothing, use only with good ventilation
Environmental Precautions: Prevent further leakage or spillage if safe to do so, avoid discharge into drains, surface and ground waters
Cleanup Methods: Contain spillage with sand or inert absorbent material, collect in containers for disposal following local regulations, ventilate area well, thoroughly wash contaminated zone
Safe Handling: Work under local exhaust or fume hood, keep away from open flames, sparks, hot surfaces, or potential ignition sources, ground and bond all transfer and storage equipment
Storage Requirements: Store in tightly closed container in a cool, dry, well-ventilated place, segregate from oxidizing agents and acids, protect from light and moisture, label containers clearly to avoid accidental mixing or confusion
Transfer and Use: Avoid splashing, use tools and containers that minimize risk of leakage or vapor release
Engineering Controls: Use ventilation such as fume hoods or general exhaust systems to keep atmospheric concentration below occupational exposure limits
Personal Protective Equipment: Wear safety glasses or goggles, chemical-resistant gloves, lab coat or apron, certified respirator if concentrations approach recommended exposure levels, adequate footwear to prevent skin exposure
Exposure Limits: No established OSHA or ACGIH exposure limits for 3-Methylthiophene yet, use caution to avoid unnecessary inhalation or skin contact based on workplace risk assessment
Physical State: Liquid at room temperature
Odor: Strong, unpleasant, sulfurous
Boiling Point: Roughly 110–112°C
Melting Point: Below room temperature, typically liquid under most conditions
Flash Point: Estimated close to 20–25°C
Density: Around 1.03–1.05 g/cm3
Solubility: Poor in water, readily soluble in organic solvents such as ether, methanol, and acetone
Vapor Pressure: Moderate at room temperature, contributes to volatility and flammability risks
Partition Coefficient: Log Kow value suggests moderate hydrophobicity, persistent in organic phases
Reactivity: Flammable and sensitive to sources of ignition, prone to polymerization or decomposition at high temperatures or in presence of strong acids
Chemical Stability: Stable under normal handling and storage conditions, decomposes on heating to produce noxious fumes including sulfur oxides
Incompatible Materials: Strong oxidizers, strong acids, alkali metals
Hazardous Decomposition: Sulfur dioxide, carbon monoxide, carbon dioxide, other volatile organic fragments
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Effects: May cause irritation of respiratory tract, dizziness, nausea, central nervous system effects at high vapor concentrations
Chronic Effects: Lack of comprehensive data in humans, no reports linking it to long-term disease with typical occupational exposure, animal studies suggest possible toxicity to internal organs with repeated exposures
Carcinogenicity: Not classified as carcinogen by IARC or NTP as of current knowledge
Other Concerns: Like many low molecular weight organosulfur compounds, can exacerbate symptoms in people with chemical sensitivities
Aquatic Toxicity: Moderately toxic to aquatic life based on structure and limited test data
Persistence and Degradability: Not readily biodegradable, can persist in the environment if released in quantity
Bioaccumulation: Potential for bioaccumulation exists based on partition coefficient, implications for aquatic food chain if contamination occurs in significant amount
Soil Mobility: Moderate, can leach from soil into groundwater if large spills occur and cleanup is slow
Waste Disposal: Gather waste in sealed, labeled containers, avoid release to environment, follow local and national regulations for hazardous chemical disposal
Incineration: Preferable because complete combustion destroys organic sulfur, must be managed in controlled facilities
Contaminated Packaging: Clean thoroughly before recycling or disposal, never reuse containers for other chemicals or purposes
UN Number: Assigned as per flammable liquids category based on international transport regulations
Transport Hazards: Flammable liquid, possible inhalation danger if container is compromised during transit
Packing Group: Middle risk category, protection from leaks, fire, and mechanical damage necessary during shipping
Special Precautions: Clearly label and secure containers, avoid stacking heavy loads, never transport with strong oxidizers or incompatible chemicals
Chemical Inventory Status: Listed by most regulatory agencies overseeing industrial chemicals, specific thresholds for reporting and use might exist in some regions
Classification: Flammable liquid, irritant under global harmonization schemes
Restrictions: Use within permitted limits, restrictions on environmental discharge or disposal in sensitive areas, notification requirements for industrial users dealing with significant quantities
Worker Safety Laws: Employers must provide appropriate training, safety equipment, and maintain proper recordkeeping for spill response and emergency procedures involving this material
