For pleated filter cartridges, ISO 2941 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 2941 — Scope
ISO 2941 specifies the designation system, dimensions and tolerances of pleated filter cartridges — 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 2941 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 2941
| Outer diameter (mm) | Length (mm) | Micron rating (u00b5m) | End connection | Reference standard |
|---|---|---|---|---|
| 65 | 250 | 1 / 5 / 10 / 25 | DOE / 222 / 226 | Pleated 5x area |
| 65 | 500 | 1 / 5 / 10 / 25 | DOE / 222 / 226 | Pleated 5x area |
| 65 | 750 | 1 / 5 / 10 / 25 | DOE / 222 / 226 | Pleated 5x area |
| 83 | 500 | 1 / 5 / 10 / 25 | 226 bayonet | Pleated 5x area |
Equivalent Standards
ISO 2941 (collapse/burst resistance) is used with ISO 3724 (flow fatigue) and ISO 16889 (multi-pass beta rating) for finished filter elements.
Companion Standards
ISO 2941 controls the geometry of pleated filter cartridges. 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).