Perfluoroether rubber is a multifunctional and multipurpose sealing material. According to many reports, the perfluoroether rubber produced by DuPont is widely used in various modern military aircraft, chariots, spacecraft, liquid rockets and various missiles. Because Kalrez perfluoroether elastomer has excellent strong oxidant resistance, perfluoroether elastomer is widely welcomed by users because of its excellent high and low temperature performance and drug resistance, but its price is surprisingly high, 3 ~ 400 times higher than other fluororubbers, and it is also difficult to process. Dupont's perfluoroether elastomer Kalrez series sells for $5,500 per kilogram. The United States, Japan and other western countries regard perfluoroether elastomers as military products, and the export control is quite strict, especially for China and Russian countries.

However, many enterprises are already using domestic perfluororubber sealing rings. All the materials are imported, which can achieve the same effect, but the price is much cheaper and the delivery time is particularly fast. After all, it was produced in China.