... fire retardant and self-extinguishing 3)Weatherproof 20mm pvc rigid foam sheet .Features: 1) Feather light, non-absorbent, fire ... Non-corrosive, non-toxic and chemical resistant4) Tough, rigid with high impact strength5) Non-warping and stain proof6 ... , ducts.Specifications:1) Thickness: 1--20mm2) Standard sheet: 1,220 x 2,440mm,1,560 x 3 ... -531-83238988Fax: 0086-531-83260439 20mm pvc rigid foam sheet