We manufacture Zircon Flour. The specs are as follows. SIZE 300 MESH TO 320 MESH (POWDER). 40 TO 80 (GRITS SIZE). SOFTENS 1450 TO 15000 C SHRINKAGE 1600 TO 17000 C MELTING 1900 TO 20000 C HARDNESS 7 TO 7.5% BULK DENSITY 1.60(FOR POWDER) COLOUR WHITE ZrO2. 62 TO 65% SiO2 30 TO 35% TiO2 0.13% Fe2O3 0.11% Al2O3 0.16% CaO 0.04% MgO 0.01% PeO5 0.01% Kindly let's know if it suits your requirement. Also available Muscovite Mica Powder stable upto 1100 C. It's being used by leading friction products and high-temperature grease manufacturers.