... bridges and irrigation works; rustproof, de-oxidation, and paint removal for metallic parts.Main structureInner layer: Using natural ... hose; rubber hose for waterway desilting, cementing pump truck, concrete, grout, sediment, coal injection truck, bulk cement truck, ... sand, steel shot, sediment, ball bearing, cement powder, cement concrete, dry powder mortar, coal fines, carbon powder, and mineral ...