Table 2: Typical Physical Properties Typical Physical Properties* Property Test Method Typical Values Dimensional Stability ASTM D 2126 2% linear change Compressive Strength  ASTM D 1621 20 psi*** Water Absorption  ASTM C 209 <1% by volume Moisture Vapor Transmission  ASTM E 96 <One (1) Perm Product Density ASTM D 1622 Nominal 2.0 lbs./cu. ft. Flame Spread (foam core) ASTM E 84 25** (based on full 10 min. test) Service Temperature - -100 deg. F to 250 deg. F Max. * The Physical Properties listed above are presented as typical average values as determined by accepted ASTM test methods and are subject to normal manufacturing variation. This data is offered as a service to our customers and is subject to change. All information can be confirmed by contacting Koppers. ** These numerical ratings, as determined by ASTM Test Method E-84, are not intended to reflect hazards presented by these or any other material under actual fire conditions. ***Also available in 25psi.  Return to Koppers KOP-R Roof Insulation - Isocyanurate