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Physical Properties of Expandable Polystyrene

Reference ASTM C578-95 Standard Type 1

Property Value
Typical Density lbs./cu. ft. 1.0
Thermal Resistance (R) at 75° 3.92
Thermal Resistance (R) at 40° 4.17
Water Vapor Transmission Perm Inches 0.8 - 2.8
Water Absorption % Volume <2.0
Flame Spread Rating* <5.0

* This numerical flame spread is not intended to reflect hazards presented by this or any other material under actual conditions.

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