aluminum oxide waterproof abrasive sand paper 1.size:230*280(9"* ... wet and dry processing in industries of automobile, aerospace, ship, furniture, leather, jewels, plastic, ceramics, glass ,textile, etc. Materials: Abrasives: silicon ... surface polishing; putty grinding; metal grinding; rust removing; wood and synthetic material grinding and polishing. Specifications: 230mm ×280mm(9×11), grit ...