Expanded graphite yarn is for weak acid and alkali, ammonia, water, oil medium, valves, as static sealing anticorrosion and sealing effect is the best. Fiber packing a good thermal conductivity, acid and alkali resistance, applicable to all kinds of solvents, gasoline, water, liquid nitrogen of pumps, valves, reactor sealed (another good thermal conductivity, acid and alkali resistance, high temperature resistance, used in high-speed operation under the condition of dynamic and static seal). After twisting, weaving into the packing, PTFE packing is a kind of pure PTFE dispersion resin as raw material, first made raw film. The PTFE without other additives. It can be widely used in food, medicine, papermaking chemical fiber etc. have strong corrosion medium valve with high cleanliness requirements, and, not suitable for use in the pump.

     Aramid fiber packing has excellent high speed, high modulus properties (called artificial metal line) its strength is three times as much as the wire, weight than the metal wire light five times. So with the other types of packing comparison, it can resist particles crystallization medium and higher temperatures can be used alone or in combination with other packing, suitable for containing solid particles of wear easily medium, recommended for use in a superheated steam, solvent, liquefied petroleum gas, syrup and other grinding fluid. On the pump system is a good substitute for asbestos products.

    Graphite stuffing is solid carbide reaction to, the nitrogen is the main part of the carbon fiber of non carbon elements were almost totally take the overflow, carbon content close to 100% graphite fibers. The release of nitrogen is the result of the further condensation reaction of the small six angle carbon net, and the possible. About 6% to 7% nitrogen is removed during the process of graphite, which leaves a lot of pore defects and the pore of overflow travel time path, which leads to the peak value of Vp in the process of graphite. Shows that in about 2200 DEG C, nitrogen almost completely removed, the porosity value; 22 DEG C, porosity VP decreased sharply, the density rises rapidly, small aromatic ring of the condensation reaction of nitrogen removal is graphite packing in the process of the main reaction, to elements of the fiber composition, porosity and density with significant changes to.