cellular polystyrene

cellular polystyrene

An insulation composed principally of a polymerized styrene resin which has been processed to form a rigid foam having a closed-cell structure.
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The water absorption demonstrated by the EPS insulation is within the range of the maximum threshold specified in ASTM C578 "Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation" (by less than 1%) while XPS insulation exceeds the maximum threshold by more than 18%.