Quick guide: grain grading Each abrasive grain offers multiple grit sizes, based on need. “Grit size” refers to the size of the abrading mineral used. Several different standards may be used to assign a grit size (or grade number). The two most common are...
More
Quick guide: grain grading Each abrasive grain offers multiple grit sizes, based on need. “Grit size” refers to the size of the abrading mineral used. Several different standards may be used to assign a grit size (or grade number). The two most common are the United States ANSI and the European FEPA “P” grade. The below chart illustrates popular conversions between the aforementioned grading systems. FEPA ANSI JIS Avg. Grain Dia. (µm) Extra Coarse P16 16 16 1292 20 P20 20 973 24 P24 24 743 30 626 P3 30 36 36 523 P36 40 40 412 P40 50 P50 50 328 P60 60 60 262 P80 80 196 80 P100 100 157 100 P120 122 120 120 P150 150 98 150 P180 180 76 180 P220 220 66 220 P240 240 58 280 P280 240 52 320 P320 46 360 P360 280 40 400 P400 35 P500 320 500 30 P600 600 26 P800 400 22 800 P1000 500 18 Extra Fine P1200 600 1000 15 FEPA Federation of European Producers of Abrasives ANSI American National Standards Institute, also known as CAMI (Coated Abrasives Manufacturers Institute) JIS Japanese Standardization
Less
