Silicon Carbide Grit

Black silicon carbide is an excellent abrasive material for rock tumblers, due to its hard, durable surface which effectively removes rough edges from rocks.

Hard angular structures of this media allow for shorter blast times than more friable, soft materials like brown fused aluminum oxide. Furthermore, its hard angular structure enables repeated uses as it wears down over time and exposes new sharp cutting edges.


Black silicon carbide is hard and features angular particles which sharpen when crushed, making it an effective abrasive for rock tumbling, gem cutting, and lapidary work of all sorts.

On the Mohs scale of hardness, only boron carbide and diamond are harder. Furthermore, its hardness is significantly greater than brown fused aluminum oxide; wear-off tends to occur more slowly, with sharp edges emerging as it disintegrates over time.

This grit is frequently employed as the initial rough grind in vibratory tumblers and second stage rotary tumblers. When combined with less aggressive aluminum oxide tumbling media, such as polishing stones that were ground down by more coarse silicon carbide particles. Furthermore, it’s widely popular as an economical solution for rough grinding glass and stone for carving applications – readily available in multiple sizes for maximum convenience.


Silicon carbide grit, unlike soft rocks, is extremely hard and could result in injury if used incorrectly. Furthermore, it could fracture under pressure or impact, so when handling this abrasive material it’s wise to wear protective gear such as masks and work in well ventilated spaces.

An angular silicon carbide grit proved more efficient in erosion tests than spherical steel round grit, in terms of surface damage to metal Babbitt grade 7 and AISI T1 steel when subjected to erosion at 30deg incident angles, 45deg incident angles 60deg incident angles and 90deg incident angles respectively.

Mama’s Minerals offers black silicon carbide grit for use as the third tumbling step with softer rock types or as a second stage in vibrating tumblers, providing an ideal finishing step when working with vibrating tumblers and vibrating tumblers. It can also be used for rough grinding flat laps and spheres in lapidary equipment and for texturizing cone 6 oxidation glazes as an option to add texture to pots and sculpture.


Silicon carbide’s long-term durability makes it a highly desirable abrasive material, popularly used in grinding, water jet cutting and sandblasting processes. Wet/dry sanding with coarser grits also uses silicon carbide effectively in removing rust, deburring metals such as glass or metal surfaces such as wheels as well as polishing stone surfaces and marble flooring refinishing wood flooring refinishing projects.

Quartz sand is an exceptional abrasive for rock tumbling, providing rapid and efficient smoothing of rocks and gemstones when used alongside the appropriate sequence of tumbling media.

Carborundum or black silicon carbide (SiC), is an inert chemical compound of silicon and carbon with high tensile strength and low thermal expansion. Found naturally as the rare mineral moissanite and manufactured synthetically since 1893 as an abrasive, Carborundum has become increasingly popular as an alternative to diamond as a material for dental abrasives, cutting tools, wear-resistant wear linings for automobile brake linings, electrical contacts etc. It is often made into wear-resistant forms for such uses as automobile brake linings for automobile brakes linings as wear resistant material with extreme hardness characteristics ideal for wear-resistance making it suitable as wear resistant materials for automobile brake linings linings or electrical contacts.


Silicon carbide grit can be handled safely; however, its dust can be harmful when ground or sanded, necessitating protective gear like masks when working with it in well ventilated spaces.

Black silicon carbide grit is an excellent choice for the coarse grind in tumblers and makes an ideal starting material in rotary tumblers. It excels at etching glass, tumbling gemstones, metal/stone carving, frosting/blasting high performance frosting/blasting as well as serving as the first step of high performance frosting/blasting processes.

This grit has an extremely hard Mohs hardness of 9 to 9.5 and its sharply pointed particles facilitate rock abrading during tumbling compared to beach, river or windblown sands with their round grains that don’t abrade rocks during tumbling. Furthermore, this durable media will last you for years at once and save money from repeated sanding or purchasing of new media for each tumbler run; recycling it multiple times makes this less expensive than aluminum oxide grit.

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