For filter discs, ISO 9044 base cloth defines the specification designations and tolerances. The sections below describe the scope, the properties it leaves to companion standards, and the equivalent designations across standards bodies.
ISO 9044 base cloth — Scope
ISO 9044 base cloth specifies the designation system, dimensions and tolerances of filter discs — 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 base cloth 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 base cloth
| Diameter (mm) | Mesh / micron options | Layers | Edge treatment | Reference standard |
|---|---|---|---|---|
| 10 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Plain cut or spot welded | ISO 9044 base cloth |
| 20 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Plain cut or spot welded | ISO 9044 base cloth |
| 38 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Spot welded or bound rim | ISO 9044 base cloth |
| 50 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-7 | Aluminum / SS bound rim | ISO 9044 base cloth |
| 100 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | Aluminum / SS bound rim | ISO 9044 base cloth |
| 200 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | SS bound rim | ISO 9044 base cloth |
| 300 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | SS bound rim | ISO 9044 base cloth |
Companion Standards
ISO 9044 base cloth controls the geometry of filter discs. 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 base cloth
Choose ISO 9044 base cloth for international procurement and OEM supply where ISO documents are the contractual reference. It is the default modern specification for filter discs.