polyester mat An excellent basic material for waterproofing membrances. It has passed ISO9001:2000 certificate. Delivery f Polyester mat for waterproofing membrane Material:100% polyester Specifications:140g/sm to 250g/sm. Application:1).An ideal substrate material for asphalt roofing rolls and shingles.2).An excellent basic material for waterproofing membrances.3).Act as the lining for roof ...