Silicon Carbide Grit For Sandblasting


Silicon carbide, recognized as one of the finest abrasives, serves not only as an abrasive and refractory material but also finds application in industry as a raw material for sandblasting, employed in rust removal. In this article, we will delve into the applications of silicon carbide grit for sandblasting.

What is the Sandblasting Rust Removal Process?

Sandblasting rust removal is a common surface treatment process used to eliminate corrosion, dirt, and coatings from metal surfaces. This technique involves the high-speed projection of sand or other abrasive particles to frictionally and impactfully clean the metal surface, achieving a cleaning and preparation effect.

Injection Material Selection

The sandblasting process mentioned earlier involves the high-speed projection of abrasive particles for rust removal. Typically, about 80% of the market opts for silicon carbide grit as the preferred blasting material. The reasons for this choice are as follows:

Hardness and Wear Resistance: Silicon carbide is a material known for its high hardness and strong wear resistance. In sandblasting operations, silicon carbide particles can effectively remove rust, coatings, and dirt from metal surfaces, enhancing the cleaning results. This improved efficiency in rust removal leads to increased work efficiency and cost reduction.

Chemical Stability: Silicon carbide exhibits strong resistance to chemical corrosion. The crystal structure of silicon carbide contains silicon and carbon atoms, forming very sturdy covalent bonds between them. This robust chemical bonding makes the molecular structure of silicon carbide highly stable and less prone to chemical reactions. This advantage is particularly beneficial for surface treatments of metals that are susceptible to corrosion.


Renewability: Silicon carbide is a naturally occurring mineral material that is relatively abundant. In terms of renewability, it may have advantages compared to some artificially synthesized abrasive materials.

Cost-effectiveness: Silicon carbide grit is relatively more cost-effective compared to some other high-performance abrasive materials. It can effectively reduce production costs for businesses, thereby enhancing overall profitability.

Selection of Silicon Carbide Grit:

Silicon carbide grit is typically classified into two main types: F-grade (F sand) and P-grade (P sand). In sandblasting rust removal, F-grade sand is commonly preferred. F-grade sand is softer and generally more affordable than P-grade, making it more suitable for tasks such as surface treatment, rust removal, and cleaning.

Here are recommended grit sizes for silicon carbide F-grade sand:

Coarse-grit F sand: Suitable for heavy-duty rust removal and cleaning tasks, targeting the removal of thicker layers of oxidation, welding slag, and similar contaminants. Common coarse-grit sizes fall within the range of F24 to F36.

Medium-grit F sand: Suitable for general surface treatment and rust removal tasks, providing a relatively smooth surface finish. Common medium-grit sizes fall within the range of F46 to F60.

Fine-grit F sand:
Suitable for tasks requiring finer surface treatment, targeting the removal of light oxidation and achieving a smoother surface finish. Common fine-grit sizes fall within the range of F80 to F120.

The above is some usage advice for silicon carbide grit in sandblasting. As a manufacturer with 19 years of experience in abrasives, Yafeite can provide you with the most professional industry advice and the most competitively advantageous abrasive products.

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