The conventional regulations filter bags, the punched felt material, sewn seam joint, economical and practical, for the deep percolation of accuracy, applying to the situation of lower filtration request. There are polypropylene polyester/PTFE to choose, having extensive chemistry compatibility, can handle various sour alkali liquid, organic melting agent and various neutral liquid. There is no silicone oil in the craft, no chemistry thing to release. Feature and advantages: Accuracy:1~600micron PP temperature:90centigrade PE temperature:160centrigrade Import new-born fiber, having great chemistry stability Eliminate any kinds of debris Deep filtration, strong ability of containing debris Stainless o-ring or patented o-ring No silicone oil or any other lubricant composition