Rex Industries offers Asbestos-Free Fibre Jointing Sheets with Acid Resistant Grade. Rex Industries manufactures High Quality Sealing Products. These Asbestos-Free Fibre Jointing Sheets with Acid Resistant Grade or RI 980 Acid are recommended for use against hot concentrated organic, inorganic and mineral acids. These are available with anti-stick coating or graphite coating. The Asbestos-Free Fibre Jointing Sheets with Acid Resistant Grade have density g/cc: 1.75 and tensile strength as per ASTM F152 IN MPa: 13.