TERM-ABSOLUTE-EFFICIENCY
Absolute Efficiency
Filtration Performance
Also: single-pass efficiency · absolute filtration efficiency
Abbrev: AE
Canonical Definition
Filter efficiency expressed as the percentage of particles of a specified size removed in a single pass through the filter element, derived from the Beta ratio: Absolute Efficiency = (1 − 1/β_x(c)) × 100%. A β₁₀(c) of 200 corresponds to 99.5% absolute efficiency at 10 µm. Absolute efficiency ratings are measured under standardised multi-pass test conditions per ISO 16889.
Engineering Context
Absolute efficiency is the correct metric when specifying filters for critical systems including servo valves, proportional valves, and precision hydraulic actuators. Unlike nominal efficiency, absolute efficiency values are reproducible across test laboratories because they derive from a defined multi-pass test protocol.
Applicable Standards
Related Technologies
Protection Systems
Knowledge Center Articles
KC-00 Governance Metadata
| Permanent ID | TERM-ABSOLUTE-EFFICIENCY |
| Category | Filtration Performance |
| Status | Published |
| Version | 1.0 |
| Last Reviewed | 2026-07-05 |
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