• Black SiC is a man made mineral with a high thermal conductivity rating of 100 W/m-K.
  
• Black SiC is extremely hard, around a Mohs 9.1 or 2550 Knoop.
  
• High strength at elevated temperatures.  For example, at 1000oC, SiC is 7.5 times stronger than Al203 (aluminum oxide).
  
• Black SiC will contain some free silicon and carbon and thus is not as pure as green SiC.
  
• Black will range in purity from 97-99% pure, depending on grit size. 
  
• Unless your application requires an extremely pure SiC, by default, black is preferred due to its more economic pricing.

Green Silicon Carbides:

• Green SiC is made from Silica sand and coke, and is extremely pure.
• Hexagonally shaped, it breaks into very sharp particles.
• Our green SiC is 99.5% pure
• Green SiC is harder than black, coming in at a 9.4 Mohs and 2600 on the Knoop scale.
• Green is often the media of choice when it comes to wire sawing (JIS 800, JIS 1000, JIS 1200, JIS 1500)
• Green SiC can be graded per your specs given sufficient volume is met.