FEPA P-grade · Converted
P500 in CAMI grit and microns.
P500 paper averages about 30.2 µm on the FEPA table. On the US CAMI scale that is about CAMI 360. A sheet printed plain "500" is a different animal: about 20 µm, nearer P1000. If the instructions say P500 and the pack has no P on it, reach for the CAMI number, not the digits.
- Avg. particle
- ~30.2 µm
- FEPA table
- Nearest CAMI
- 360
- by particle size
- Plain "500"
- ~20 µm
- CAMI 500 ≈ P1000
- 3M Trizact
- ·
- no A-grade paired by 3M
What P500 is for
Fine primer sanding and color-coat scuffing.
Either side of P500
The neighborhood.
Questions people ask
What is P500 in CAMI grit?
About 360. P500 averages 30.2 microns on the FEPA table and CAMI 360 averages 28, so the scratch is close to the same.
How many microns is P500 sandpaper?
About 30.2 microns average particle diameter, per the FEPA P-grade table (ISO 6344).
Is P500 the same as 500 grit?
No. P500 averages 30.2 microns; a sheet printed plain "500" on the CAMI scale averages 20, which is closer to P1000. The CAMI sheet is the finer of the two.
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.