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.