TERM-TEST-DUST
ISO 12103-1 Test Dust
Fluid Cleanliness
Also: ISO test dust · ACFTD · standardised test contaminant · SAE J726 dust
Abbrev: A2 Fine · ACFTD
Canonical Definition
Standardised artificial test contaminants defined by ISO 12103-1 for use in filter performance testing. Four grades are specified: A1 Ultrafine (0–80 µm), A2 Fine (0–150 µm, median ~18 µm), A3 Medium (0–280 µm), and A4 Coarse (0–600 µm). The A2 Fine grade is the primary dust used in ISO 16889 multi-pass tests for hydraulic filters and ISO 5011 tests for air filters. All grades are silica-based with defined particle size distributions, ensuring reproducibility across test laboratories worldwide.
Engineering Context
The controlled particle size distribution of ISO 12103-1 test dust enables reproducible filter performance tests across different laboratories and manufacturers. Field dust is not used in standardised tests because its composition, shape, and size distribution vary by geography, season, and industrial environment. Test dust results provide a consistent baseline for performance comparison, not a prediction of absolute field service life.
Knowledge Center Articles
KC-00 Governance Metadata
| Permanent ID | TERM-TEST-DUST |
| Category | Fluid Cleanliness |
| Status | Published |
| Version | 1.0 |
| Last Reviewed | 2026-07-05 |