... :Environmental protection,non-toxicity raw material. longevity :anti-corrosion,anti-rust,anti-abrasion,excellent anti-pressure capability. competitive price: lower than stipulated ... avallable, whole material dying for long lasting. anti-theft:non-recycle,anti-theft naturally . low noise:Harsh n oise ... , heat supplied, gas well As cover board for anti-corrosion project, open ditch;it was well as can ...