What are the principles for selecting the number of sandpaper sheets?
Jul 17,2026
The principle of choosing thickness according to needs: choose low mesh number (40-80#) for rough defects, thick rust, and large-area leveling to quickly remove excess material; use medium mesh number (120-600#) for paint priming and fine lines elimination; choose high mesh number (above 800#) for mirror brightening and fine polishing.
Principle of step-by-step progression: Grinding must be done sequentially from coarse to fine, and skipping across steps is not allowed, otherwise the deep scratches left by rough grinding cannot be completely removed.
Principles for matching materials: For cork, plastic, and painted surfaces, avoid too low mesh numbers to prevent deep scratches; for hard metals and castings, coarse mesh numbers can be used for efficient removal.
Principle of dry and wet adaptation: Coarse sand below 800 mesh is suitable for dry grinding and rough processing, while fine sand above 800 mesh is more suitable for water grinding to reduce sand blockage and paste.
The principle of efficiency taking into account smoothness: do not blindly use fine sandpaper to deal with large-area burrs, take into account the polishing speed and the fineness of the finished product surface.
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