Cellular polystyrene | Article about cellular polystyrene by The Free Dictionary
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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Standard specification for rigid, cellular polystyrene
While EPS and XPS are two different products, they do have some similar characteristics and fall under the same manufacturing standard: ASTM C578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation.
different types and physical properties of cellular polystyrene intended for use as thermal insulation.