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1,4 -Butynediol is a stable, non-reactive and non-oxidizing, slightly volatile organic solid with a melting point of 56°C, a measured Flash Point of 136°C, and a vapor pressure of 0.00015 hPa at 20 °C. It is not classified as dangerous / hazardous with regards to flammability, explosiveness, reactivity, or as an oxidizer according to Regulation (EC) 1272/2008 or Directive 67/548/EEC.