White corundum‘s merit as sandblasting media

- Jun 19, 2019-

       White corundum‘s merit as sandblasting media

Due to the performance advantages of white corundum, such as high hardness, good toughness, high specific gravity, and no harmful substances, white corundum is a natural environmentally friendly grinding material that plays an important role in the international blast cleaning industry. However, in addition to white corundum, brown fused alumina, green silicon carbide, and other abrasives are often used for blasting treatment, then what are the main advantages of white fused alumina compared to them?


Roughly, the white corundum currently used as a grinding medium accounts for 45% of all industrial use. The advantages of white corundum are as follows:

First, the amount of dust is low

Surface blasting with white corundum, due to its relatively high specific gravity, produces less dust during the spraying process. This ensures operator health and safety and improves operator visibility. Compared with slag (the slag formation process is to use high-temperature cooling with cold water or even sea water, so the glass phase structure is formed, which is brittle). Because the slag is relatively brittle, it is easy to be crushed and formed during the blasting process. Particles. Due to the relatively small specific gravity of the slag, small slag particles are suspended in the air, causing environmental pollution. Similarly, quartz sand is also a very fragile abrasive.


Second, super high efficiency

White corundum, under certain pressure, can quickly hit the surface of the object with sharp edges and corners, so it is regarded as a very fast way of spraying. The acceleration and velocity of the particles in the gas stream is the effect of the white corundum inertia and particle size. The smaller the particles, the easier the acceleration, so higher impact forces can be impacted on the surface of the object, resulting in a very high cleaning speed – typically, this speed (m2/hr) is twice as fast as other conventional abrasives.

The ratio of glass beads and white corundum used in sandblasting is about 4:1 (mainly based on the degree of matt of your own observation surface, the use of glass pellets to the ratio of 1:1 is available to customers); the less white corundum, The better the matt effect, the more white corundum is added to improve the efficiency of shot peening, while eliminating the slight scratches on the stainless steel surface. If it is a liquid blasting room, the amount of sand added is about 75-125kg; the glass pill is added first according to the ratio, and the white corundum is added in multiple times, which makes it easier to control the surface matt effect.