Benefits of PVC Foam PVC foam widespread use in advanced composites is due to its many advantages. The benefits it provides are: High strength and stiffness to weight ratio Process friendly Rot resistance Resistance to solvents and most chemicals Very good fatigue properties Very good thermal insulation Good fire behavior Low water absorption Compatible to many resin systems including epoxy Low resin absorption Durability Ease of adhesion Shock absorbance When processing PVC foam overlaid by prepreg, great caution shoild be taken to avoid outgasing