foam formation
3.Phenolic foam is a new generation heat preservation prevent fire soundproof material and polystyrene together ammonia ester foaming rubber etc, material to compare, and it is good that its biggest characteristics is a heat-proofound the low temperature contractility is smatt, and have te special prevent burning wit the size stability under 2000℃heat, not burning, not melt not contract constant form not poisonous spirit hove no thick smoke, just surface formation layer.

