Silicon Carbide Sanding

Silicon carbide is a hard and sharp abrasive that’s great for rough-sanding and deburring metal and other materials. It also works well on plastic and fiberglass, removing material without building heat that can melt the workpiece.

Its versatility and effectiveness make it a must-have in the world of bodywork and restoration. In more fine grits, it’s the artisan’s choice for preparing a surface for paint or stain.


Whether you are tackling rough material removal or a fine finish, silicon carbide sanding can help achieve your desired results. This steadfast abrasive material stays resilient against heat degradation, allowing it to effectively withstand the intense pressure of sanding applications that generate significant amounts of friction and heat.

The grains of silicon carbide are razor-sharp, making it a suitable abrasive for a wide range of materials and applications. It can be used to sand and polish metal, marble, stone, glass, cork, medium-density fiberboard, and more. Silicon carbide can be found in a variety of grits, from coarse to fine. It can be used dry or wet. It is commonly used in conjunction with aluminum oxide sandpaper in the rough and final sanding stages of woodworking projects.

Sanding discs are manufactured by bonding the silicon carbide grains to a paper or cloth backing, which is then applied to a disc. The type of backing determines the disc’s flexibility and durability. A paper backing is more flexible, while a cloth backing is more durable and better suited for heavy-duty projects.


Silicon carbide is the hardest common abrasive grain, ranking higher than aluminum oxide in the Mohs scale of hardness. This makes it ideal for sanding rough surfaces and harder materials, such as rust, wood finishes, and non-ferrous metals.

While silicon carbide grit is not as resilient as aluminum oxide, it can endure high levels of pressure without breaking down prematurely. This allows the abrasive to work for longer periods, making it ideal for tasks like removing old paint or sanding between coats of stain.

Silicon carbide sandpaper is also great for preparing surfaces for painting and decorating. It can be used to sand and smooth furniture finishes prior to repainting, or sand between coats of varnish or shellac on hardwoods and metals. It can also be used to create a smooth finish on concrete surfaces.

Heat Resistance

Silicon carbide is more heat resistant than aluminum oxide sanding products, making it ideal for hot-weather applications like sanding stone and glass. However, you still want to be mindful of how much pressure you apply, as using too much force can damage the abrasive and cause gouges in your material surface.

In addition to its heat resistance, silicon carbide sanding delivers consistent and predictable results. Unlike some abrasives, which suffer from grit deterioration over time, silicon carbide remains resilient and sharp, offering a dependable, uniform finish.

Whether you’re removing old paint or preparing surfaces for a fresh coat of primer, sanding with silicon carbide allows you to complete projects with confidence and precision. To determine the make-up of your abrasive, look for a code on the label that indicates its composition. Silicon carbide is marked as A, while aluminum oxide is marked as C. This will help you select the correct sandpaper for your project needs.


Unlike other abrasive materials, silicon carbide resists thermal degradation and remains stable throughout use. This steadfast composition empowers the abrasive to perform consistently and effectively, fostering precision across diverse applications. Additionally, unlike aluminum oxide sandpaper, silicon carbide does not experience grit deterioration during the sanding process.

The abrasive material is crushed into small, razor-like grains before being bonded to the sanding paper or cloth. The size of these grains determines the grit. A coarse grit will have larger grains, while a fine grit will have smaller ones.

The abrasive can be used wet or dry, though it is more effective when paired with water. Wet sanding is useful for minimizing airborne dust while providing a more consistent finish. It is also ideal for tasks like removing paint and rust or sanding between coats during finishing.

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