??Type O sealing ring, natural rubber, neoprene, ethylene-propylene rubber, fluorine rubber, silicone rubber, and blending rubber manufacturing.

??Except with the general requirements of seal material, seal also note the following conditions:

??(1) full of elasticity and resilience;

??(2) the appropriate mechanical strength, including expansion strength, elongation and tensile strength, etc.

??(3) the performance is stable, not easy swelling in the medium, small heat shrinkage effect (joule effect).

??(4) easy to processing molding, and can keep the precision of size.

??(5) no contact corrosion, no pollution medium, and so on.