There are provided self-extinguishing compositions comprising, for each 100 parts of a polyolefin as such or containing inert fillers and/or other additives, from 5 to 30 parts of an ammonium or amine phosphate, from 3 to 20 parts of one or more nitrogen organic compound which, upon heating in the presence of the ammonium or amine phosphate, decompose to form a non-dripping carbonaceous mass, the nitrogen-containing compounds being selected from among (a) reaction products of aliphatic or aromatic diisocyanates or triisocyanates and organic compounds having reactive hydrogen atoms; (b) a mixture of (a) and/or an aldehyde/amine or aldehyde/urea reaction product with a polyamide; and (c) a mixture of an amine with a polyamide. The foregoing compositions provide acceptable levels of self-extinguishing properties without being corrosive or emitting toxic smokes or gases in the proximity of an open flame.
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