Views: 0 Author: Site Editor Publish Time: 2025-12-08 Origin: Site
I. Efficiency Classification (Core Standard)
Primary Efficiency Filters (GB/T 14295)
Function: Intercept particles ≥5μm (such as dust, hair) for pre-filtration.
Efficiency: 40%~90% by weight method (G1-G4 grades).
Medium Efficiency Filters (GB/T 14295)
Function: Capture particles of 1~5μm (such as pollen, fine dust) to protect downstream high-efficiency filters.
Efficiency: 60%~95% by colorimetric method or counting method (F5-F9 grades).
High Efficiency Filters (GB/T 13554)
Function: Filter particles of 0.1~0.3μm (bacteria, viruses), suitable for clean rooms, hospitals, etc.
Efficiency:
High Efficiency (HEPA): ≥99.99% (H11-H14)
Ultra-High Efficiency (ULPA): ≥99.999% (U15-U17)
II. Classification by Shape
Type | Applicable Grade | Characteristics |
Primary | Flat structure made of metal mesh/non-woven fabric, easy to clean, low resistance. | |
Medium (Mainstream) | Multiple cloth bags connected in parallel, large dust-holding capacity, uniform air volume. | |
High, Ultra-High | Folded filter media arranged in V-shape, large filtration area, long service life. |
III. Common Filter Materials
Material | Applicable Filters | Characteristics |
Synthetic Non-Woven Fabric | Primary, Medium | Low cost, washable (only for primary efficiency filters). |
Glass Fiber | High, Ultra-High | High filtration precision, high temperature resistance (moisture-proof required). |
Melt-Blown Polypropylene | Medium, High | Enhanced efficiency through electrostatic adsorption, commonly used in medical scenarios. |
Composite Filter Paper | High | Glass fiber + PTFE coating, waterproof and corrosion-resistant. |
