FEPA P-grade · Converted
P50 in CAMI grit and microns.
P50 paper averages about 336 µm on the FEPA table. On the US CAMI scale that is about CAMI 50. A sheet printed plain "50" is about 348 µm, close enough that the P barely matters at this grade.
- Avg. particle
- ~336 µm
- FEPA table
- Nearest CAMI
- 50
- by particle size
- Plain "50"
- ~348 µm
- CAMI 50 ≈ P50
- 3M Trizact
- ·
- no A-grade paired by 3M
What P50 is for
Heavy removal when 40 is too savage and 60 is too slow.
Either side of P50
The neighborhood.
Questions people ask
What is P50 in CAMI grit?
About 50. P50 averages 336 microns on the FEPA table and CAMI 50 averages 348, so the scratch is close to the same.
How many microns is P50 sandpaper?
About 336 microns average particle diameter, per the FEPA P-grade table (ISO 6344).
Is P50 the same as 50 grit?
Close enough to treat as the same. P50 averages 336 microns and CAMI 50 (a bare "50" on US paper) averages 348.
Convert any other grade, from CAMI, microns or a Trizact A-number, on the grit converter.
Sizes are average particle diameters from the published FEPA (ISO 6344) and CAMI (ANSI B74.12/B74.18) tables. "Nearest" means within 10%; otherwise both neighbors are shown. Trizact pairings are 3M's own. Sources: Wikipedia, "Sandpaper" grit table (rev. 1127917881); Klingspor coated abrasives grit chart.