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A(z) Sandpaper Grit Converter kiszámítása

Mi az a Sandpaper Grit Converter?

The Sandpaper Grit Converter translates between the two major sandpaper grit standards: CAMI (Coated Abrasives Manufacturers Institute, US standard, simple numerical grit like 220) and FEPA (Federation of European Producers of Abrasives, European standard with P-prefix like P220). Despite similar numbering, the two systems use different particle size measurements — at low grits (below 220) they're roughly equivalent; at high grits (above 220) FEPA particles are smaller and finer.

Képlet

CAMI grit roughly corresponds to FEPA P-grit at low values; diverges at higher grits where FEPA represents smaller particles
G
Grit Number (CAMI or P) — Industry standard grit measurement
μm
Particle Size (microns) — Actual abrasive particle diameter

Útmutató lépésről lépésre

  1. 1Enter grit number in CAMI, FEPA, or particle size (micron)
  2. 2Calculator finds closest match in standard reference table
  3. 3Outputs CAMI number, FEPA P-grade, and particle size in microns
  4. 4Categorizes by use case: extra-coarse, coarse, medium, fine, very fine, extra fine, super fine, micro fine
  5. 5Suggests next step in sanding progression

Worked Examples

Bemenet
CAMI 220 (fine sanding)
Eredmény
FEPA P220, 68 microns — final sanding before stain/seal
Bemenet
P150 (medium)
Eredmény
CAMI 150, 100 microns — general sanding, primer prep
Bemenet
FEPA P2000
Eredmény
CAMI 2000, 10.3 microns — automotive paint correction, super fine

Common Mistakes to Avoid

  • ✕Assuming CAMI 320 equals FEPA P320 — at higher grits they diverge significantly
  • ✕Skipping grits in sanding progression — should go up no more than 2x grit (60→80→120 not 60→200)
  • ✕Using too fine grit on rough wood — wastes paper and time without removing material
  • ✕Not cleaning surface between grits — coarser dust degrades finer grit performance

Frequently Asked Questions

What grit should I start with?

Depends on starting condition: rough lumber → 60-80 grit. Smooth lumber → 100-120. Already-sanded → 150-180. Final before staining → 220. Between coats → 320. Don't skip more than ~2x grit at a time.

Can I sand too finely?

For staining wood, yes — beyond 220 grit, the surface becomes too smooth to absorb stain evenly. Stop at 180-220 grit for stained wood. For sealed/painted/clear-coated finishes, go finer (320-600 between coats).

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