How to chose abrasive materials for sandblasting service

- Apr 23, 2018 -

The hardness of the abrasive determines whether the sandblasting particles can form an etch or form an anchored appearance on a specific substrate surface. One way to determine the hardness of the abrasive is the Mohs hardness scale. The range of the ruler is from 1 to 10, where 1 means softest (mica) 10 means hardest (diamond).

The hardness of the sandblasting pellets, which generally creates the anchor chain appearance, is 6.0 or higher. However, there are also some soft pellets that require a range of 3.0 to 4.5. These pellets do not form an etch on the glass or steel surface, but they remove dirt and provide surface cleanliness. They are mainly used to prevent damage to the surface of the substrate or areas where sandblasting particles or residues can cause damage to the surrounding environment. Soft sand blasting pellets are usually used in areas where there are bearings or other vulnerable machines.

Steel sand and steel shots are hard abrasives, and hardness is expressed by Rockwell C method. The hardness range is between 42 and 65. The steel grit forms an etch on the surface of the steel structure, while steel shots form dents on the surface of the steel structure.

Garnet abrasives can achieve SA3 higher sandblasting grades in metal blasting.

Abrasives vary in shape, angular, block, semi-circular or spherical. Sharp-edged horny abrasives have a high cleaning rate when they adhere to a dense substrate or dirt.

The sharp edges of the horned abrasive can form a chain-like appearance on the surface of the steel, providing a good mechanical attachment for the coating.

Except for very difficult to remove dirt, the block abrasive can guarantee a good cleaning rate.

Semi-circular or spherical abrasives can form dents on the surface. These abrasives are mainly used to increase the surface hardness. The

The weight of the abrasive can affect the surface cleanliness and surface roughness. The weight is expressed in pounds per cubic foot. The specific gravity refers to the density of the particles, and the major ratio means weight. When the pressure is the same, the heavy chain has a deeper chain-like appearance. Dramatically, the abrasive produces less dust, and the lighter-weight pellets have less impact on the substrate and are mainly used for light blasting or polishing, burr removal, and the like.