... )XB300,XB350,(high pressure)XB400,XB450,XB510.(2)Material:Made of asbestos Fibre, rubber and heat-resisting packing material, compressing ... 4)Technical parametersDensity:1.6-2.0g/cm³Working pressure:13-14MPaTensile strength:≥21.0MPaAging Coefficient:≥0.9Burning Loss:≤28% ... CrackStress-relaxation:≤50Steam Airtightness:with the temperature of 500-510°C and the pressure of 13-14MPa,Keep for 30 min without ...