... ,material:PTFE+Spring 2,Factory direct sales,competitive price 3,Low friction effection PTFE Spring Energized SealMaterial:PTFE+StainlessAdvantages:1,It ... movement and adapt to most fluids and chemical2,Small friction coefficient,it will not crawl under precise control,corrosion ... resistance is strong and dimension stability is well;3,It can withstand the rapid temperature changes;4,No ...