DDM CONCUT MP900 blades are designed for cutting all types of refractory brick. Refractory brick are typically harder and denser than standard brick. They usually contain additives like alumina and silica to make them more resistant to heat and/or chemicals. These bricks are used in furnaces, chimneys, kilns, ovens, and places of high acidity. MP900 blades need to be used wet cutting only.