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Physical Properties of Expandable Polystyrene

Reference ASTM C578 Standard Type X

Property Value
Typical Density lbs./cu. ft. 1.3
Thermal Resistance (R) per inch of thickness at 75� 5.00
Water Vapor Permeance per inch of thickness 1.1
Water Absorption % Volume <1.0
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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