... 3. high filtration efficiency 4. basic weight 320g Pocket filter fabric F6 (GH320-OEM)1. 50m/roll2. 70mm-1000mm ... white OEM level 4. for air purification Pocket filter (air purification) non-woven, is applicable for large ... .•2003, Research and Development Automotive air filter material,and Establied Retop Filter Materials Co., LTD •2004, Started ... to 26,000 Squaremeters. F6 pocket filter fabric