... 2)fire retardant and self-extinguishing 3)Weatherproof 20mm pvc foam board/sheet .Features: 1) Feather light, non-absorbent, fire retardant and ... for corrosive environments, ducts.Specifications:1) Thickness: 1--20mm2) Standard sheet: 1,220 x 2,440mm,1,560 x 3,050mm ... PROVINCE, CHINATel: 0086-531-83238988Fax: 0086-531-83260439 20mm pvc foam board/sheet