Mullite M45 is an Alumino-Silicate produced by the calcination of selected kaolins. Mullite M45 is the standard back-up refractory material in the production of Investment Casting shell moulds. A wide range of sized grades, carefully de-dusted, ranging from the very fine 30-80 to the 16-30 is used as stucco in the investment process and also Mullite M45 ( –200 mesh) is used as filler in the production of investment slurries and offer outstanding properties in term of stability and consistency for both water and alcohol based systems.