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Does the FSK (Foil-Scrim-Kraft) facer used on Johns Manville insulations comply with ASTM C 921?

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Does the FSK (Foil-Scrim-Kraft) facer used on Johns Manville insulations comply with ASTM C 921?

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ASTM C 921 Standard Practice for Determining the Properties of Jacketing Material for Thermal Insulation is not a “Standard Specification”, and it does not state required materials properties. It is not possible for a material to “comply” with ASTM C 921. It is a “Practice” which means it is intended to give some guidance in choosing appropriate materials.

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