January 01, 1970
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Mainly made of USA or Holland-imported polyaramide ( a chemical synthetic filament of the strength 10 times that of steel), used for braiding of seal packing.
The products made of asbestos are rejected step-by-step when people demanding more and more on the health and environment-protection. Expandable teflon and flexible graphite are used much more widely than ever in modern industry.
Made of polypropylene fiber by reinforcing, braiding and impregnating with PTFE. Phenolic fiber in corners give the packing much better wear resistance.