Product Identification
【Product Name】1H-Pyrazole
【Synonyms】1,2-Diazole 吡唑
【CAS】288-13-1
【Formula】C3H4N2
【Molecular Weight】68.08
【EINECS】206-017-1
【RTECS】UQ4900000
【RTECS Class】Reproductive Effector
【Merck】12,8144
【Beilstein/Gmelin】103775
【Beilstein Reference】5-23-04-00122
【EC Class】harmful, irritant

Physical and Chemical Properties
【Appearance】Colorless crystals.
【Solubility in water】Very soluble
【Melting Point】66 - 68
【Boiling Point】186
【Vapor Pressure】0.89 (25 C)
【Density】1.026 - 0.952 g/cm3 (70 - 155 C)
【pKa/pKb】11.53 (pKb)
【Partition Coefficient】.32
【Heat Of Vaporization】40.6 kJ/mol
【Heat Of Combustion】-1858 kJ/mol
【Usage】Chelating agent.
【Refractive Index】1.4203 (20 C)

First Aid Measures
【Ingestion】If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
【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. Wash clothing before reuse.
【Eyes】Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage
【Storage】Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
【Handling】Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.

Hazards Identification
【Inhalation】Inhalation of dust may cause respiratory tract irritation.
【Skin】May cause skin irritation.
【Eyes】May cause eye irritation.
【Ingestion】May be harmful if swallowed.
【Hazards】During a fire, irritating and highly toxic gasesmay be generated by thermal decomposition or combustion.
【EC Risk Phrase】R 22 36/37/38
【EC Safety Phrase】S 26 36/37/39

Exposure Controls/Personal Protection
【Personal Protection】Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. 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】May cause reproductive and fetal effects.

Fire Fighting Measures
【Flash Point】88
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Accidental Release Measures
【Small spills/leaks】Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity
【Disposal Code】3
【Incompatibilities】Oxidizing agents, acids.
【Stability】Stable under normal temperatures and pressures.
【Decomposition】Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Transport Information
【HS Code】2933 19 90