1.1 ,This specification covers the composition and physical properties of polyimide foam insulation with nominal densities from 1.0 lb/ft³ to 8.0 lb/ft³ ,(16 kg/m³ to 128 kg/m³) and intended for use as thermal and sound-isolating insulation for temperatures from −,423°,F to +600°,F (−,253°,C to +316°,C) in commercial and industrial environments.