TERM-PROGRESSIVE-DENSITY-GRADIENT
Progressive Density Gradient
Air Intake
Also: graded density · density gradient media · depth gradient construction · tapered pore structure
Abbrev: PDG
Canonical Definition
A filter media construction in which fibre packing density increases progressively from the upstream (dirty) face to the downstream (clean) face of the filter element. The outer, lower-density zones capture large particles and act as pre-filters; the inner, higher-density zones capture fine particles at high efficiency. This gradient maximises dust holding capacity while maintaining low initial restriction and high overall filtration efficiency — the opposite of surface filtration, which loads rapidly at a single capture plane.
Engineering Context
Progressive density gradient construction is used in MACROCORE primary air filter elements and high-performance hydraulic elements. By distributing particle capture throughout the full depth of the media rather than concentrating it at the surface, dust holding capacity increases by 40–120% compared to single-density media of equivalent thickness, at the same efficiency rating.
Related Technologies
Protection Systems
Knowledge Center Articles
KC-00 Governance Metadata
| Permanent ID | TERM-PROGRESSIVE-DENSITY-GRADIENT |
| Category | Air Intake |
| Status | Published |
| Version | 1.0 |
| Last Reviewed | 2026-07-05 |