Grit Size Conversion Table
Selecting the right fraction is the first step to quality results. The table below matches four main diamond micron powder marking systems: W-marking (average size in μm), GOST 9206-80 (ASM), mesh (cells per inch) and size range in micrometers.
Full Conversion Table
| W (μm) | GOST 9206-80 (ACM) | mesh | Range, μm | D50 μm | Typical Application |
|---|---|---|---|---|---|
| W60 | ACM 60/40 | — | 40–60 | 50 | Rough grinding, forming |
| W40 | ACM 40/28 | — | 28–40 | 34 | Grinding, stone processing |
| W28 | ACM 28/20 | — | 20–28 | 24 | Medium grinding |
| W20 | ACM 20/14 | — | 14–20 | 17 | Finish grinding, lapping |
| W14 | ACM 14/10 | — | 10–14 | 12 | Lapping, pre-polishing |
| W10 | ACM 10/7 | — | 7–10 | 8.5 | Polishing, optics |
| W7 | ACM 7/5 | — | 5–7 | 6 | Fine polishing |
| W5 | ACM 5/3 | — | 3–5 | 4 | Final polishing, optics |
| W3.5 | ACM 3/2 | — | 2–3.5 | 2.75 | Super-polishing |
| W2.5 | — | — | 1.5–2.5 | 2 | Superfinish, laser optics |
| W1.5 | — | — | 1.0–1.5 | 1.25 | Nano-polishing |
| W1 | — | — | 0.5–1.0 | 0.75 | Nano-polishing, semiconductors |
| W0.5 | — | — | 0.25–0.5 | 0.375 | Sub-micron polishing |
How to Read the Table
- W designation — indicates average grain size D50 in micrometers. W20 = D50 ≈ 20 μm.
- GOST 9206-80 (ACM) — sieve-based marking: ASM 20/14 means grain passes 20 mesh sieve and stays on 14 mesh sieve.
- mesh — number of sieve cells per inch. Higher mesh = finer grain.
- D50 — median size: 50% of grains are smaller than this value.
Fraction Selection Guide
Can't find the right fraction?
We supply any fraction in the 0.25–60 μm range on custom order (3–7 days). Trial batch — from 1 kg.