Description Premium quality nitrile based cork-elastomer jointing, especially recommended for use with unleaded fuels. Previously designated Nebar® PR. Prime features Exceptional resistance to a wide range of fuels, oils and solvents. Suitable for many fluid sealing applications in the automotive, engineering and electrical industries. Originally developed for use with Askarel transformer fluids. +115°C maximum operating temperature in liquids. Retains flexibility down to -5°C. Specifications Complies with ASTM F104 P2245A; and ASTM F104 line call out F226000M1. Fluid compatibilities Suitable for use with air, water, alcohols, fuel and diesel oils, unleaded fuels, mineral and synthetic lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM Fuel A, BS 148 Transformer Oil. Physical properties (Tested to ASTM F104 procedures) Hardness, IRHD: 60 to 75 (ASTM D1415) Tensile strength, MPa minimum: 1.5 (ASTM F152B) Compressibility @ 2.8N/mm², %: 25 to 40 (ASTM F36B) Recovery, minimum %: 75 (ASTM F36B) Fluid resistance, % volume change in: ASTM Oil No 1, 72h @ 100°C: -5 to +10 (ASTM F146) IRM903, 72h @ 100°C: -5 to +15 (ASTM F146) ASTM Fuel A, 22h @ ambient: -2 to +10 (ASTM F146) BS148 Transformer Oil, 14 days @ 90°C: +1 (ASTM F146) Unleaded petrol, 8 months @ 18-22°C: +11 (ASTM F146)