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Standard

FEPA-P

European coated-abrasive (sandpaper) grading, ISO 6344

FEPA-P is the European sandpaper grading (the P numbers), defined by ISO 6344. The micro grades (P240 and finer) are defined by a particle-size distribution (ds3 / ds50 / ds95). The distribution tables for P240 to P1200 are recovered here from a free national adoption (JIS R6010), and P1500 to P2500 from the free ISO 6344 sample. Coarse grades are sieve-graded.

Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale, a shared yardstick for reading grit numbers across makers.

Particle sizemicrons, log
100503020105
coarserfiner
inkmeasured or standardmaker figureour estimate
shapeknown distributionpoint, spread unknown
P40Standard-defined
median
425 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #40

P50Standard-defined
median
336 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #50

P60Standard-defined
median
269 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #60

P80Standard-defined
median
201 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #80

P100Standard-defined
median
162 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #90

P120Standard-defined
median
125 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #120

P150Standard-defined
median
100 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #150

P180Standard-defined
median
82 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #170

P220Standard-defined
median
68 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #200

P240Standard-defined
median
58.5 µm

spread 81.7 to 44.5 µm · reference scale about #230

P280Standard-defined
median
52.2 µm

spread 74 to 39.2 µm · reference scale about #260

P320Standard-defined
median
46.2 µm

spread 66.8 to 34.2 µm · reference scale about #280

P360Standard-defined
median
40.5 µm

spread 60.3 to 29.6 µm · reference scale about #320

P400Standard-defined
median
35 µm

spread 53.9 to 25.2 µm · reference scale about #350

P500Standard-defined
median
30.2 µm

spread 48.3 to 21.5 µm · reference scale about #400

P600Standard-defined
median
25.8 µm

spread 43 to 18 µm · reference scale about #470

P800Standard-defined
median
21.8 µm

spread 38.1 to 15.1 µm · reference scale about #550

P1000Standard-defined
median
18.3 µm

spread 33.7 to 12.4 µm · reference scale about #640

P1200Standard-defined
median
15.3 µm

spread 29.7 to 10.2 µm · reference scale about #740

P1500Standard-defined
median
12.6 µm

spread 25.8 to 8.3 µm · reference scale about #900

P2000Standard-defined
median
10.3 µm

spread 22.4 to 6.7 µm · reference scale about #1100

P2500Standard-defined
median
8.4 µm

spread 19.3 to 5.4 µm · reference scale about #1400

P3000Standard-defined
median
7 µm

Coarse grade, sieve-graded.

spread sieve-graded · reference scale about #1850