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1. Definition:it is made of black PTFE, and there is silica gel in its central part as the elastomeric, and it has better compressibility after being machined by weaving-machine.2. Technique Specification:SPECIFICATIONCentrifugal ?separatorReciprocating pumpValvePH VALUE0 ?- ?14PRESSURE (BAR)30100200WORKING TEMPERAURE-200 CENTIGRADE ~ 288 CENTIGRADElink:http://www.gasket-china.com/gland-packing/ptfe-fiber-packing/graphite-ptfe-packing-with-silica-gel-core.html