We supply raw materials for investment casting shell mould slurry system: colloidal silica, the ceramic slurry binder; mullite(alumina silica) refractory for primary and backup coats and stucco;antifoam and wetting agents. We accept small orders. If you have any inquiries, please contact us. Mullite Al2O3 44-48% SiO2 47-51% Fe2O3 max 0.8% TiO2 max 1.0% Colloidal Silica JN-30 SiO2%: 29.0-31.0 Na2O%: less than 0.30 pH: 8.5-10 Density (25癈, g/mL): 1.19-1.21 Viscosity (25癈), mPa.s: less than 7.0 Average particle diameter (nm): 10-20 Appearance: clear to opalescent shelf life: 12 months Packaging: PVC container, 25 Kg or 250 Kg per drum