Manual sandblasting machines generally use pomegranate sand, quartz sand, river sand, etc. However, quartz sand, river sand, copper ore, etc. There is a risk of silicosis and cancer, because they contain free silicon and toxic heavy metals, and they are now banned from being used as abrasive blasting.

In addition, according to the material of the required sandblasting workpiece, the desired effect and the surface treatment after sandblasting, the appropriate abrasive is selected.

Material of sandblasting workpiece and the effect to be achieved

Because different materials have different properties, their hardness is also different. For example, when selecting abrasives for steel structures and aluminum parts, if abrasives for spraying steel structures and aluminum parts are used, sand embedding may occur. The second is the desired effect, what is the surface roughness requirement, and what is the standard of sandblasting grade effect, whether it is 30-60 microns or 45-80 microns, whether it is Sa2.5 or Sa3. There are different requirements for the choice of abrasives. When choosing abrasives, we must pay attention to the requirements of the owners, especially there are different standards abroad, whether it is SSPC, ISO or ASTM.

Grinding characteristics

The characteristics of abrasive need to mainly consider the hardness, shape, particle size and transportation convenience of abrasive. For example, shape, generally speaking, the more angular surfaces, the sharper the sharp corners, so that more particles can impact and rust at the same time when sandblasting, and the efficiency can be higher. For example, RZG garnet sandblasting is a rhombic dodecahedron. In use, 65,438+065,438+000,000 particles per kilogram of 30/60 mesh garnet abrasive can hit the surface of the workpiece, while only 654,380,000 particles of 20 mesh copper slag can hit the surface of the object.