Product Identification
【Product Name】2-Methylthiophene
【Synonyms】alpha-Methylthiophene；2-甲基噻吩
【CAS】554-14-3
【Formula】C5H6S
【Molecular Weight】98.17
【EINECS】209-063-0
【RTECS】XM9625000
【RTECS Class】Other
【Beilstein/Gmelin】103734
【Beilstein Reference】5-17-01-00324
【EC Class】highly flammable

Physical and Chemical Properties
【Appearance】Clear, colorless liquid.
【Solubility in water】Slightly soluble
【Melting Point】-63℃
【Boiling Point】113℃
【Vapor Pressure】48℃
【Density】1.0231 g/cm3 (15℃)
【Heat Of Vaporization】34.11 kJ/mol
【Heat Of Combustion】-3474 kJ/mol
【Refractive Index】1.5203 (20℃)

First Aid Measures
【Ingestion】Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
【Inhalation】Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
【Skin】Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
【Eyes】Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage
【Storage】Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area.
【Handling】Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Take precautionary measures against static discharges. Do not breathe dust or fumes.

Hazards Identification
【Inhalation】Causes respiratory tract irritation. May be harmful if inhaled. May cause nausea, dizziness, and headache.
【Skin】Causes mild skin irritation. May be harmful if absorbed through the skin.
【Eyes】Causes mild eye irritation.
【Ingestion】May cause irritation of the digestive tract. May be harmful if swallowed.
【Hazards】Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will sp along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
【EC Risk Phrase】R 11 20
【EC Safety Phrase】S 16 23 36/37
【UN (DOT)】1993

Exposure Controls/Personal Protection
【Personal Protection】Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
【Respirators】Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
【Exposure Effects】The toxological properties of this substance have not been fully investigated.

Fire Fighting Measures
【Flash Point】8℃
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Use water spray to keep fire-exposed containers cool. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
【Fire Potential】HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.

Accidental Release Measures
【Small spills/leaks】Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool.

Stability and Reactivity
【Disposal Code】1
【Incompatibilities】Oxidizing materials, strong bases.
【Stability】Stable under normal temperatures and pressures.
【Decomposition】Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.
【Combustion Products】Fire may produce irritating, corrosive and/or toxic gases.

Transport Information
【UN Number】1993
【Hazard Class】3
【Packing Group】I; II; III
【HS Code】2934 99 90