Non-metallicupholsteredpiece ismadewithanon-metallicsealingmaterials processinggasket.Asbestos rubbersealing plate, PTFE, rubber,and othernon-metallicmaterial.In recent years,non-asbestosfiberrubberseal plategasketmaterial.Pipe flanges, asbestosrubber sheetgasketaccounted formostnon-metallicupholsteredpiece.Asbestos rubberseal plate,referred to as theCAF(compressedAsbestosFibre).Asbestos fibersdue toits main ingredientisharmful to human body,andintheprocessofproduction and useof asbestosdustwillpollute the environmentcaused bythepoisonon the human body,thedeveloped countriesfromthe 1980shadprohibitedthe production and useofasbestos products.Withthedevelopment and progressofChina's economic construction,theimportanceofenvironmental protection as well asthe namesofthe safety oftheproduction and useofasbestos productsisstrictly controlled. ThePTFE gasketgeneral useincorrosive media;made of rubberpipe flangegasketis applicabletotheflangebolt preloadsmalleroccasions,suchasaglasspipe flangesor other low-strengthpipe flanges,so thattheinsmallerbolt preload,thegasketcan be generatedthelargercompressive deformationclosetotheflange.Therubbergasketisnot too highinthelowermedium pressureand temperatureconditionsonly.