1. Know the sandpaper specifications

2. Know the granularity of sandpaper

The granularity of the sandpaper indicates the size of the sand grain, and the unit is generally the number of mesh. The larger the number of mesh, the finer the sand, and the smoother the surface treatment effect. Generally, the granularity of sandpaper is divided into the following categories: 60 mesh sandpaper, 80 mesh sandpaper, 120 mesh sandpaper, 180 mesh sandpaper, 240 mesh sandpaper, etc.

3. Choose the right sandpaper

When choosing sandpaper, you need to first understand the situation of the item to be processed, such as metal, wood or ceramic. Each material has different hardness and ductility, so it is necessary to choose the right sandpaper to avoid over - or under-filing.

For example, for wood, it is recommended to use coarse sandpaper (60 mesh, 80 mesh) to remove burrs, scratches and other rough parts, and then use medium sandpaper (120 mesh, 180 mesh), and finally use fine sandpaper (240 mesh or more) for grinding. This results in a smooth surface.

4. Precautions

(1) Sandpaper should be kept flat and dry. It is best to use dry sandpaper for processing metal, which can avoid rust due to humidity.

(2) Reasonable use of sandpaper. Do not blindly use fine sandpaper for grinding, and do not overuse coarse sandpaper for filing, so as not to damage the processed items.

(3) Sandpaper should be replaced regularly. For frequently used sandpaper, such as 60 mesh, 80 mesh, it is recommended to replace it regularly to maintain the processing effect.

(4) Personal protection measures. Wear protective measures such as gloves and masks when using sandpaper to protect your health.

https://www.xfabrasive.com/sand-paper/