
Norton 3X Sheet Sandpaper, 80 Grit (20-pack)
When 100-grit has been disappointing you and you're done being patient.
FEPA P-grade · Converted
P80 paper averages about 201 µm on the FEPA table. On the US CAMI scale that is about CAMI 80. A sheet printed plain "80" is about 190 µm, close enough that the P barely matters at this grade.
What P80 is for
The first real pass on raw wood; shaping body filler.
Either side of P80
At this grade

When 100-grit has been disappointing you and you're done being patient.

80 on Granat: where precision starts and the surface first takes notice.

Mesh that breathes. Finnish grain that does not load. Both in the same disc.
Questions people ask
About 80. P80 averages 201 microns on the FEPA table and CAMI 80 averages 190, so the scratch is close to the same.
About 201 microns average particle diameter, per the FEPA P-grade table (ISO 6344).
Close enough to treat as the same. P80 averages 201 microns and CAMI 80 (a bare "80" on US paper) averages 190.
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.