Specification summary of ISO 4022 as applied to sintered fiber felt: what the standard controls, the tolerance system it defines, the full specification range, and the equivalent ISO/ASTM/DIN documents.
ISO 4022 — Scope
ISO 4022 specifies the designation system, dimensions and tolerances of sintered fiber felt — 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 4022 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 4022
| Micron rating (u00b5m) | Thickness (mm) | Porosity (%) | Form | Reference standard |
|---|---|---|---|---|
| 3 | 0.35 | 75 | Sheet / cut disc | ISO 4022 |
| 5 | 0.40 | 78 | Sheet / cut disc | ISO 4022 |
| 10 | 0.45 | 80 | Sheet / cut disc | ISO 4022 |
| 20 | 0.55 | 82 | Sheet / cut disc | ISO 4022 |
| 40 | 0.60 | 83 | Sheet / cut disc | ISO 4022 |
| 60 | 0.70 | 85 | Sheet / cut disc | ISO 4022 |
Equivalent Standards
ISO 4022 defines permeability testing of sintered permeable metal media.
When to Specify ISO 4022
Choose ISO 4022 for international procurement and OEM supply where ISO documents are the contractual reference. It is the default modern specification for sintered fiber felt.
Specifying Sintered Fiber Felt Beyond the Standard
- Rating: Approximately 3–60 µm.
- Porosity: Up to about 80 % for high dirt-holding capacity.
- Support: Laminated with mesh for pleating and handling.
When Sintered Fiber Felt Is Not the Right Choice
Not for applications needing a rigid self-supporting plate.
