250 mesh denotes 250 wires per inch in each direction. For plain weave wire mesh the governing document is ISO 9044 / ASTM E2016; the specification row, aperture-micron conversion and selection guidance for this count follow.
250 Mesh Specification Row (ISO 9044 / ASTM E2016)
| Mesh count | Wire diameter (mm) | Aperture (mm) | Micron rating (u00b5m) | Open area (%) | Weight SS (kg/mu00b2) | Reference standard |
|---|---|---|---|---|---|---|
| 250-Mesh | 0.040 | 0.062 | 62 | 36.8 | 0.21 | ISO 9044 |
250 Mesh to Micron & Aperture
| Openings per inch | 250 |
|---|---|
| Aperture (opening width) | 0.062 mm |
| Micron rating | 62 µm |
| Standard wire diameter | 0.04 mm |
| Open area | 36.9 % |
Aperture = (25.4 mm ÷ mesh count) − wire diameter. The micron rating equals the aperture in micrometres; actual retention also depends on particle shape and cake formation.
Wire Diameter Options at 250 Mesh
| Option | Wire dia | Aperture | Micron | Open area | Weight (SS) |
|---|---|---|---|---|---|
| Heavy wire | 0.052 mm | 0.050 mm | 50 µm | 23.8 % | 0.35 kg/m² |
| Standard wire | 0.040 mm | 0.062 mm | 62 µm | 36.8 % | 0.21 kg/m² |
| Fine wire | 0.030 mm | 0.072 mm | 72 µm | 49.7 % | 0.12 kg/m² |
Heavier wire adds strength and abrasion life but closes the aperture; finer wire opens the aperture and raises throughput at the cost of durability. Specify mesh count AND wire diameter to fix the aperture unambiguously.
Open Area & Flow at 250 Mesh
The standard 250 mesh weave presents an open area of about 36.9%. A common design rule is to keep the clean-mesh approach velocity low enough that initial pressure drop is negligible; the mesh then acts as the cake support.
250 Mesh Cloth Weight
Standard 250 mesh stainless cloth weighs approximately 0.21 kg/m² (density 7.93 g/cm³ basis; brass and copper weave roughly 10% heavier, aluminum about one third). Use this figure for roll handling and freight estimation.
Typical Applications for 250 Mesh Plain Weave Wire Mesh
250 mesh plain weave wire mesh is commonly specified for liquid filtration and clarification, extruder screen packs, hydraulic and fuel strainers, pharmaceutical and food sieving, and laboratory test work.
When to Step Up or Down from 250 Mesh
Move to 325 mesh when particles are passing that must be retained; drop back to 200 mesh when the element blinds too quickly or the pressure drop is excessive. In a multi-layer pack, pair this count with a coarser support mesh downstream to carry the pressure load.