- 2025-07-09
Absolute Filtration Technology Standard
Absolute Filtration Technology Standard
Definition and Classification Standards
Absolute filtration refers to the retention rate of the filter element for target particle size being ≥99.9% (β value ≥1000), with the following core performance parameters:
Precision Identification:
Nominal aperture (μm) Actual retention particle size (μm) Test standard
0.1 ≥0.13 ASTM F838-05
0.22 ≥0.30 ISO 16890-2016
5.0 ≥5.3 GB/T 18853-2015
Efficiency verification:
Latex bead challenge test: >99.98% (5μm particles)
Bacterial retention rate: >7-log (Pseudomonas aeruginosa)
Key application scenarios
Category Target Contaminant Precision Requirement Typical Filter Material
Medical Dialysis Endotoxin 0.1μm Hydrophilic PTFE Membrane
Drinking Water Safety Cryptosporidium Oocysts 1.0μm Meltblown Polypropylene
Semiconductor Ultra-pure Water Colloidal Silicon 0.03μm Ceramic Membrane
Industrial Implementation Plan
■ Structural Design
Graduated Density Filter Layer: Surface 5μm/Deep Layer 0.5μm (Anti-Surface Clogging)
Membrane Folding Technology: Effective Area Increased by 300% (Compared to Flat Membrane)
■ Operating Parameters
Design Filter Rate: ≤10m³/㎡·h (Ensures Retention Rate)
Maximum Pressure Difference: 0.2MPa (Prevents Structural Deformation)
Selection Specification
Microbial Control
Sterilization Requirements: Select 0.22μm sterilizing-grade filter core (FDA 21 CFR 210.3)
Virus Retention: Requires a composite 0.01μm ultrafiltration membrane (molecular weight cut-off 100kDa)
Chemical Compatibility
Filter material pH tolerance range Applicable medium
Nylon 66 4-10 Organic solvents
Polyethersulfone1-13Strong acid/alkali systems
