... stamping . In 2009, we get the China National Patent in oil filter. And we also get the ISO 9001:2000 and ... rigidity, intension and impaction. The filters has high strenthen, large oil flow and easily clean/1--- Materials: 302, 304,304L, 316 and ... -resisting and wear-resisting etc.4--- Uses: used in mine oil, Chemical industry, food industry, pharmaceutical industry and machines producing.Feature ...