Propylene

Propylene ... reacts vigorously with oxidizing materials. Under unusual conditions, eg, 96.8 MPa (995 atm) and 600 K, it explodes. It reacts violently with NO2, N2O4, and N2O. Explosions have been reported when liquid propylene contacts water at 315-348 K.

A mixture under confinement in a glass pressure bottle at 20 deg C polymerized explosively, the polymerization probably being initiated by access of light through the clear glass container. Such alkene-sulfur dioxide co-polymerizations will not occur above a ceiling temperature, different for each alkene.

Explodes on contact with trifluoromethyl hypofluorite.

Explosive polymerization is initiated by lithium nitrate+sulfur dioxide.

Reacts with oxides of nitrogen to form an explosive product.

Dangerous; can react vigorously with oxidizing materials.

Incompatible materials: Strong oxidizing agents, Strong acids