Test Results Grade I (A) 1- Loss on ignition at 1000 C 0.09% 2- Moisture at 105 C 0.02% 3- Percentage of SiO2 99.55% 4- Percentage of Fe2O3 0.014% 5- Percentage of Al2O3 0.15% 6- Percentage of R2O3 0.21% Particle size ( grain size ) Results % +0.850 1.36 -0.850 + 0.710 0.34 -0.710 + 0.600 0.59 -0.600 + 0.425 4.27 -0.425 + 0.150 86.55 -0.150 + 0.075 5.63 -0.075 1.26 BULK OR OTHER