PTFE Felt Filter Bags/Teflon filter bags/ high temperature resistant liquid filter bags. 1. Detailed Description Of PTFE Felt Filter Bags/High Temperature Resistant Liquid Filter Bags. Size: 7*17”,7*32”,4*9”,4*15”, 6*22”, other size can be custom made. Micro rating: 1-15 micro. Sewn (stitched) filter bag body+ sewn (stitched) “arc” type filter bag