... FSK facing for duct wrap for HVAC systems and metal building insulation. Building Material: to be sealed on glass wool or other ... , or works as vapor barrier and thermal insulation facing of metal building. Material: Characteristic: fire retardant, anticorrosive, easy to laminate, durable. Specifications ... : 60,120, 300, 500, 1800, 3000m Foil Scrim Kraft Of Metal Building Material