Thermosetting materials in when heated usually decomposition out flammable gas, formed by the fire has certain prevent flame spreading ability carbonized layers, the carbonized depends on formula.

Flash fire - the combustion of a flammable gas or vapor and air mixture in which the flame propagates through that mixture in a manner such that negligible or no damaging overpressure is generated.

The best fire-fighting technique is simply to shut off the flow of cryogenic liquid or vaporized gas if a flammable cryogenic liquid is involved.