Silicon carbide (SiC), also known as carborundum sand, is rarely found in nature and is commonly used as a synthetic raw material in industry. It gains excellent properties of thermal resistance and wear resistance. It has two crystal forms: low-temperature morphology β- SiC, belonging to cubic structure, and high-temperature form α- SiC belonging to the hexagonal structure.  Silicon carbide has two types according to color: green silicon carbide and black silicon carbide.

90% purity silicon carbide is a kind of second-grade black silicon carbide. The silicon carbide purity is not less than 90%, ranging from 90% to 92%. 90% purity black silicon carbide mostly works as a refractory and metallurgy material instead of abrasive.

Silicon carbide castable, also known as SiC castable. It is a type of non-shape refractory material made from carborundum powder and other materials. It serves several functions in various applications:

Refractory silicon carbide is a synthetic refractory material based on SiC substance (CAS:409-21-2). It is made from silica granules and carbon material in a huge resistance electric furnace at about 2800 degrees.  Refractory Silicon carbide chunks, nubbles, and powder always work as refractory lining, furnace castale, and mortar. Silicon carbide is a better refractory aggregate and castable than aluminum oxide-based refractories for its extraordinary advantages as follows:

Black SiC and Green SiC are both hard and tough abrasion materials in the industrial field.  Besides the color difference, there are many differences in properties and performance.

Black silicon carbide is an excellent refractory material. It is widely used as a furnace lining, kiln furniture, firebrick, and crucibles.