Sealings

Besides the applications of braided packings made of PTFE impregnated and oiled P84 multifilament used in stuffing boxes of pumps and reactors, nonwovens are used as a gasket seal on a new version of automotive oil filters. The filter cartridge is fully made out of plastic material and contains no metal. The P84 sealing is used because of its stability at high temperature, resilience and chemical resistance against hot oil. The fixing of the P84 seal onto the cartridge is done by melting the polyamide into the polyimide felt ring. As the temperature applied is in the range of app. 250 °C the thermostable P84 is the material of choice. The advantage of this new concept of oil filters is the environmental friendly disposal of the used cartridges by combustion without the need of seperating the metal housing before burning.