Black Silicon Carbide Grit

Black silicon carbide grit is one of the toughest blasting media available and often used in rock tumblers to tumble and polish rocks.

Black grit is an effective and cost-efficient abrasive material to use when tumbling rocks in a tumbler. Hard, durable and relatively inexpensive – perfect for the job!


Black silicon carbide (also referred to as tungsten carbide) is an extremely hard, durable mineral created in human laboratories that ranks 9.1 on Mohs’ scale of mineral hardness, second only to diamond and boron carbide as hard materials for use as abrasives.

Production involves melting together silica sand, petroleum coke and high quality petroleum coke in resistant furnaces until a material forms that can be compressed into hard and brittle granules for pressing into granules.

Granules featuring an angular shape and sharp edges offer effective cutting action when used for blasting applications, breaking down quickly to help speed material removal.

Hard and brittle material like this is relatively affordable and long-term when compared to aluminum oxide grit, making it an economical solution for rock tumbling, glass/stone/optical/vision/precision surfacing applications and precision surfacing projects. Furthermore, this material can be reused many times if stored safely between uses.

Thermal Resistance

Silicon carbide can be found on belts, disks, sheets and sponges in fine grits for use when sanding metal and glass surfaces, polishing stone and marble slabs, deburring auto parts and refinishing wooden flooring (priming surfaces for new coats of paint).

Carbon fibre’s low coefficient of thermal expansion makes it the perfect material for making telescope mirrors, while its hardness and rigidity make it suitable for high-performance blasting applications such as sandblasting or etching glass surfaces.

Diamond media is one of the hardest blasting medias available, ranking second only to diamond on Mohs’ scale of mineral hardness. Due to this hardness, it can be used more times than softer medias such as brown fused alumina which gradually breaks down with use and exposes fresh, sharp edges for effective cleaning/polishing. Furthermore, diamond is ideal for rock tumbling where its hard surface helps cut through even tough materials, often combined with alumina for even further cutting power.


Silicon carbide is one of the hardest materials on earth, enabling it to cut quickly while simultaneously shortening blast times and producing smoother surfaces. Plus, its durability reduces replacement costs and increases productivity!

Brittleness cannot be measured using a single numerical value; rather, it can be understood by observing how materials respond to stress and deformation. Brittleness in any material can be traced to its crystal structure as well as the number of slip systems within it – hexagonal close-packed (HCP) structures found in graphite for instance have three slip systems while face-centered cubic (FCC) systems found in diamond have 12 slip systems.

Silicon carbide abrasive material is known for being hard and durable, making it the perfect material for applications such as sandblasting and cutting. Due to its brittle nature, however, silicon carbide may fracture under high stress or impact; to prevent such injuries it is vital that proper protective gear and ventilation be utilized when handling this abrasive.


Silicon carbide is an extremely durable and versatile abrasive material. Found naturally as the rare mineral moissanite, silicon carbide has since been manufactured into large quantities for a variety of uses in industry and society alike.

crushed rock forms angular particles with sharp points and edges that make it ideal for grinding away rough surfaces in tumbler barrels. Plus, its relatively inexpensive price makes it an attractive choice for rock tumbling as well as lapidary work.

Hardness also makes diamond an excellent material for abrasive machining processes such as grinding, water-jet cutting and sandblasting. However, working with this powder form of the material can be hazardous; appropriate safety equipment and adequate ventilation must be utilized when working with it in its powder form. Especially important if working in closed environments is using it; also required when using glass materials that produce dust abrasively.

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