Cast Basalt is a volcanic rock, which is cast in a similar method to that of cast iron. After annealing, it forms a re-crystallized black ceramic of extreme hardness and abrasion resistance. In addition, it will withstand temperatures of up to 350º Fahrenheit. Linings made of Cast Basalt are proven to last six to ten times longer than steel, cast iron, ni-hard, etc. depending upon impact exposure.