Sandblasting impacts the surface of the material by spraying abrasive particles (e.g. sand, glass beads, steel shot, etc.) at high speed to clean, strengthen and modify the surface properties.

In this article, we’ll take a closer look at the purpose of parts blasting and how to select the right grit size for different parts.


The purpose of sandblasting parts

Remove surface dirt and oxides

parts in the processing, transport and storage process will often be attached to a variety of dirt and oxides, sandblasting can effectively remove them, so that the surface of the parts a new look.

improve the surface roughness

through the control of sand blasting parameters, you can adjust the surface roughness of the parts within a certain range, so that it is more suitable for painting, coating or bonding and other process requirements.

Increase surface adhesion

sandblasting can form microscopic concave and convex structure on the surface of the parts, improve the mechanical anchoring force of the surface and the adhesion of the coating, so as to increase the corrosion and abrasion resistance of the parts.

Improve surface appearance

sandblasting can make the surface of the parts uniformly rough, hide processing traces and defects, improve surface texture and aesthetics.


How to choose the grit

Select the type of grit according to the material and use of the parts

commonly used sand blasting materials include glass beads, aluminium oxides, steel sand, etc. Grits of different materials have different hardnesses and shapes, and are suitable for surface treatment of parts of different materials and shapes.

Determine the mesh size according to the surface treatment requirements

the mesh size is a measure of the coarseness and fineness of the sand grains, generally divided into coarse sand, medium sand and fine sand. Coarse sand is suitable for surface treatment that requires high roughness, medium sand is suitable for general requirements, and fine sand is suitable for occasions that require high surface quality.

Consider the shape and size of the part

Large or complex shaped parts usually require coarser grit and higher blasting pressure to ensure uniform and thorough blasting.

Conduct tests and adjustments

Before carrying out formal sand blasting treatment, it is recommended to carry out test sand blasting to adjust the type of grit, mesh size and blasting parameters according to the actual results, so as to ensure that the ideal surface treatment effect is achieved.


Parts sandblasting is an important surface treatment process, through the removal of surface dirt, improve surface roughness, increase surface adhesion and improve surface appearance, can improve the quality and performance of parts.

Selecting the right type of grit and mesh size is critical, and requires comprehensive consideration of the part material, shape, size and surface treatment requirements, as well as testing and adjustment to ensure that the best blasting results are achieved.

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