01 — StandardWhat is 800 mesh in microns?
800 mesh is not a standard test sieve number, so there is no official opening. With an assumed 15.9 µm wire (extrapolated beyond the ASTM E11 series), the opening is about 15.9 µm. Real wire cloth varies, so check the supplier's spec.
02 — Specifications800 mesh specifications
| Opening (microns) | ≈ 15.9 µm |
| Opening (millimeters) | 0.015875 mm |
| Opening (inches) | 0.000625 in |
| US standard sieve | Not a standard size |
| Tyler equivalent | — |
| Pitch (wire center to center) | 31.8 µm |
| Assumed wire diameter | 0.015875 mm |
| Approx. open area | 25% |
03 — ApplicationsWhat is 800 mesh used for?
The 15.9 µm opening falls within the silt (3.9 µm–62.5 µm) class of the Wentworth grain-size scale. Comparing grain size with the nominal opening only: very fine sand and coarser would be retained; silt is split at about 15.9 µm. Real sieving also depends on particle shape, sieving time and the opening tolerance of the cloth.
We have no sourced application data for openings this size yet.
Ranges show common practice with sources on the mesh size by application page — always check your equipment maker's recommendation.
04 — CalculationHow the 800 mesh value is calculated
800 openings per inch gives a pitch of 25,400 ÷ 800 = 31.8 µm. Subtracting an assumed 15.9 µm wire (extrapolated beyond the ASTM E11 series) leaves an opening of about 15.9 µm. Change the wire diameter in the calculator above to match your screen.
Before display rounding: 15.875 µm opening with 0.015875 mm assumed wire. The main estimate uses three significant digits; unit conversions retain more digits.
05 — CompareNearby mesh sizes
| Mesh | Microns (µm) | Millimeters | Inches |
|---|---|---|---|
| 500 mesh | 25 | 0.025 | 0.001 |
| 600 mesh | ≈ 21.2 | 0.0212462 | 0.000836465 |
| 635 mesh | 20 | 0.02 | 0.0008 |
| 800 mesh | ≈ 15.9 | 0.015875 | 0.000625 |
| 1000 mesh | ≈ 12.7 | 0.0127 | 0.0005 |
Values are ASTM E11 nominal openings (Tyler equivalents for 150 and 250 mesh). Italic ≈ values are estimates for non-standard mesh counts, calculated from the mesh count and an assumed wire diameter (interpolated between ASTM E11 sieves, or extrapolated beyond No. 635). Wire values are ASTM E11 typical wire for standard sizes.Data sources and review limits.
06 — FAQFrequently asked questions
How many microns is 800 mesh?
800 mesh is ≈ 15.9 µm, which is 0.015875 mm or 0.000625 inches.
What size particles can pass through 800-mesh screens?
In a simplified comparison with the nominal opening, particles smaller than about 15.9 µm can pass through 800-mesh screens. The 15.9 µm opening falls within the silt (3.9 µm–62.5 µm) class of the Wentworth grain-size scale. Comparing grain size with the nominal opening only: very fine sand and coarser would be retained; silt is split at about 15.9 µm. Real sieving also depends on particle shape, sieving time and the opening tolerance of the cloth.
What is the open area of 800 mesh?
With an assumed 0.015875 mm wire, 800 mesh has roughly 25% open area. Thicker wire lowers the open area and the opening size.