Excellent high temperature, low temperature performance, long-term use in -180 ~ +260 ℃: weather resistance, fire burn, oxygen index, non-absorbent, excellent resistance to radiation, such as long-term exposure to the atmosphere, its surface and the performance remained unchanged; excellent dielectric properties, resistance to high voltage; excellent corrosion resistance, almost insoluble in any solvent, in aqua regia acid and alkali concentration of sodium oxide is light, strong corrosive uranium pentafluoride are not corrosion; wear resistance, coefficient of static friction is the smallest plastic, good self-lubricating properties, there are outstanding non-stick surface; tensile strength is good. Widely used in aerospace, instrumentation, medical and pharmaceutical, electronics, telecommunications, petrochemicals, metallurgy electricity, household appliances, lighting and so on. Provides DN10-150mm, length F4, PVDF bellows wall thickness of 1.5mm-2.2mm standard fatigue frequency ≥ 20-20000mm 1000 times