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it is weaved or twisted by high quality asbestos wire, then soaked in lubricant and covered by graphite.this product can stand high temperature and pressure, and it is suitable for revolving shaft, piston of reciprocating pump or valve shaft, usually it is used for the sealing of thermal air, boiled water, heavy oil and other medium.Rotation axisReciprocating pumpValveOperating temperature<650℃Pressure (MPA)2243.1linear velocity (M/S)42--PH value4-10INCH ?1/83/161/45/163/87/161/25/83/47/81MM3.24.86.47.99.511.112.715.91922.225.4KG / 3M0.0480.090.1770.260.3750.5010.6510.91.52.02.5link:http://www.gasket-china.com/gland-packing/asbestos-fiber-packing/asbestos-fiber-packing-with-graphite.html