It is a product ground using sand paper with an adequate grain size to show consecutive abrasive patterns, and is most widely used for building interior/exterior materials such as sash, door and panel.
No.4 / No.8
No. 4 is a product ground using a 150~180-mesh sand paper and is a product that has fine silver-white smooth surface. No. 8 is a product ground by rotating the buff with an 800-mesh(or above) abrasive and is used for constructional interior/exterior materials, tubs, kitchen supplies, small mirror products and reflectors.
