Glass fiber fabrics made from twisted expanded-yarns with a double woven method is coated with various types of PTFE suspension solution for different applications to form PTFE coated glass fiber fabrics, and then the ePTFE membrane is pasted on the fabrics to meet the high PM2.5 removal demand for environmental concern.

The developed suspension solutions containing PTFE, graphite, coupling agent and dispersing agent greatly improve folding endurance, acid, and high-temperature resistance, and the bonding strength between glass fiber fabrics and ePTFE of the bag filter.

The twisted and expanded yarns with a double woven process developed can be trimmed to meet the demand of architecture, aerospace, and filtration industry.