Feature: 1. Wide application range. 2. Easy operation. 3. High safety. 4. Low processing cost. Application: 1. Removing metal mill scale, carbide black, surface dirt of metal or non-metal items. 2. Etching processing for glass, crystal, jade, marble, ceramics, etc. 3. Pretreatment of Teflon, PU, rubber, plastic covering, electroplating, metal spray welding, powder coating, titanizing, etc. to improve surface adhesion. 4. Eliminating burrs for bakelite, copper, aluminum die casting work piece, electronic components, etc. 5. Cleaning mill scale for cars, pretreatment before new painting to improve adhesion of the paint film.