Woven Polyester Air-slide Belt and Woven Cotton. • Specialised Treatments: PTFE Laminated Membrane. Fluorocarbon. Impregnated, Foam Acrylic, Flame Retardant, Acid Resistant, Moisture. and Oil Repellent. • Envelope Type Filter in either felted block or rubber neoprene seal. • Multi Pocket Shaker Filters in either, woven cotton or needle felt.