Micronized GB standard：W63 W50 W40 W28 W20 W14 W10 W7 W5 W3.5 W2.5 W1.5 W0.5
Day standard：#240 #280 #320 #360 #400# #500 #600 #700 #800 #1000 #1200 #1500 #2000 #2500 #3000 #4000 #6000 #8000 #10000
European standard:F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 F2000
White corundum grain size sand White corundum micropowder
