Propadiene

C₃H₄Molar mass40.065 g·mol Appearance Colorless gas Melting point−136 °C (−213 °F; 137 K) Boiling point−34 °C (−29 °F; 239 K) log P1.45 Hazards GHS labelling:

Pictograms

Signal word

Danger

Hazard statements

H220

Precautionary statements

P210, P377, P381, P410+P403NFPA 704 (fire diamond)

0

4

3

Explosive limits13% Safety data sheet (SDS) External MSDS

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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Propadiene ( ) or allene ( ) is the organic compound with the formula H₂C=C=CH₂. It is the simplest allene, i.e. a compound with two adjacent carbon double bonds. As a constituent of MAPP gas, it has been used as a fuel for specialized welding.