ISO 9044 covers the requirements for twill dutch weave mesh. Reproduced below: the complete specification table, the tolerance classes, and the companion and equivalent standards referenced when ordering to this document.
ISO 9044 — Scope
ISO 9044 specifies the designation system, dimensions and tolerances of twill dutch weave mesh — mesh count or nominal opening, wire diameter and the permissible aperture deviations. Alloy chemistry, mechanical testing and delivery condition are governed by separate documents in the same standards family.
Tolerance Classes
ISO 9044 defines tolerance limits on the average aperture and on the maximum single aperture, tightening as the aperture gets finer. For test-sieve duty the tighter ISO 3310-1 tolerances apply instead of the general cloth tolerances — specify sieve grade explicitly if the mesh will be used for particle-size analysis.
Specifications Defined by ISO 9044
| Mesh (warp x weft) | Warp wire (mm) | Weft wire (mm) | Nominal filtration (u00b5m) | Weight SS (kg/mu00b2) | Reference standard |
|---|---|---|---|---|---|
| 80x700 | 0.10 | 0.08 | 40 | 0.75 | ISO 9044 |
| 165x1400 | 0.071 | 0.041 | 10 | 0.55 | ISO 9044 |
| 200x1400 | 0.071 | 0.041 | 8 | 0.55 | ISO 9044 |
| 325x2300 | 0.038 | 0.025 | 5 | 0.35 | ISO 9044 |
| 400x2800 | 0.030 | 0.020 | 4 | 0.28 | ISO 9044 |
| 510x3600 | 0.025 | 0.015 | 2 | 0.22 | ISO 9044 |
Companion Standards
ISO 9044 controls the geometry of twill dutch weave mesh. Companions frequently cited alongside it: ISO 565 / ASTM E11 (test-sieve aperture series), ISO 3310-1 (test sieves of metal wire cloth), ISO 4783 (selection of wire and aperture combinations), ISO 9044 (industrial woven wire cloth), and ISO 2941 (collapse/burst rating for finished filter elements).
When to Specify ISO 9044
Choose ISO 9044 for international procurement and OEM supply where ISO documents are the contractual reference. It is the default modern specification for twill dutch weave mesh.
Specifying Twill Dutch Weave Mesh Beyond the Standard
- Absolute rating: Specify absolute micron with the test method (e.g. glass-bead or bubble point).
- Count: Counts such as 200 × 1400 or 325 × 2300 define the rating.
- Support: Always pair with a coarser support layer in elements.
When Twill Dutch Weave Mesh Is Not the Right Choice
Not for high-flow, low-pressure duties where the low permeability costs too much pressure drop; sintered fiber felt or pleated media may be better.
