What is Omphacite for sandblasting & waterjet cutting?
Omphacite is a kind of natural emery sand,look like brown fused alumina or garnet sand,with green particles in it,also has the same application:sandblasting and waterjet cutting, which garnet sand and brown fused alumina work it too.
Then what is Omphacite exactly?
Chemical Composition
Silica SiO2………………………………54-58%
Iron(Fe2O3+FeO)……………………….3-5%
Alumina Al2O3………………………….12-14%
Magnesium MgO…………………………5-7%
Calcium CaO………………………..….…8-11%
Manganese MnO………………………….0-1%
Sodium oxide Na2O………………………6-8%
Physical characteristic
Specific Gravity…………………………. 3.29-3.37g/cm3
Hardness………………………………….Mohs 6.6-6.8
Chloride content less than 15ppm（25ppm max）
Colour………………………………………Green
Acid solubility(HCL)less than 1%
Conductivity less than 25 ms/m
Melting point………………………………1100℃
Grain shape…………………………………sub angular
Mineralogical Composition
Omphacite………………..…………………. >85%
Almandite Garnet……………………………. <15%
Ilmenite………………………………….……<0.5%
TiO2………….. ………………….…………… <0.5%
