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KÍCH THƯỚC GIẤY NHÁM
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ISO/FEPA Grit designation
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CAMI Grit designation
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Average particle diameter (µm)
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MACROGRITS
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Extra Coarse (Very fast removal of material, hardwood flooring initial sanding)
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P12
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1815
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P16
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1324
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P20
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1000
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P24
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764
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24
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708
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P30
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642
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30
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632
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36
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530
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P36
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538
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Coarse (Rapid removal of material)
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P40
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40
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425
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50
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348
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P50
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336
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Medium (sanding bare wood in preparation for finishing, for gentle removal of varnish, also used for skateboard grip tape)
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60
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265
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P60
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269
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P80
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201
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80
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190
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Fine (sanding bare wood in preparation for finishing, not suitable for removing varnish or paint from wood, use for cleaning plaster and water stain from wood)
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P100
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162
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100
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140
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P120
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125
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120
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115
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Very Fine (sanding of bare wood)
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P150
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100
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150
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92
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P180
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180
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82
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P220
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220
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68
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MICROGRITS
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Very Fine (sanding finishes between coats)
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P240
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58.5
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240
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53.0
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P280
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52.2
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P320
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46.2
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P360
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40.5
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Extra fine, start polishing of wood
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320
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36.0
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P400
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35.0
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P500
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30.2
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360
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28.0
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P600
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25.8
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Super fine (final sanding of finishes, final sanding of wood)
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400
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23.0
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P800
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21.8
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500
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20.0
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P1000
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18.3
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600
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16.0
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P1200
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15.3
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Ultra-fine (final sanding and polishing of thick finishes)
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P1500
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800
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12.6
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P2000
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1000
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10.3
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P2500
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8.4
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