Physical and chemical properties: Physical properties, form, colour, odour: Powder or granules of violet- black colour (0-80 mm). Odour like garlic similar to acetylene. pH-value: basic Change in condition: Boiling point: 2300 C (101,3 kPa) Melting point: 1900 C Decomposition temperature: Not applicable. Flash point: acetylene - 305 C Flammability: acetylene - 17,8 C Autoflammability: none Danger of explosion: Forming of explosive compounds (acetylene - air) in contact with water. Explosion limits: Lower: 1.5 % vol. of acetylene Upper: 80.5 % vol. of acetylene Oxidizing properties: not applicable Vapour pressure: 0,1 kPa (20 C) Specific weight: (20 C) 2,2 - 2,7 g.cm Solubility in/ miscibility with: - Distribution coefficient: not applicable Dynamic viscosity: not applicable.