Non-asbestos corrugated roofing sheet was made from cement, paper pulp, PVA fiber and other inorganic additives. Just with some simple raw materials but it is not easy to make good final sheet that requests exactly in proportion of raw materials, slurry and all process. So, how to make non-asbestos corrugated roofing sheet well? To get the good final sheet, it has to go through eight basic stages. Stage 1: Preparing raw material Preparing materials in accordance with the rati