Cut Point Test

Determine filter cut point using fluidized microspheres for precise filter efficiency testing and validation.

Test Parameters
Microsphere Data
Format: size, upstream_count (one per line)
Format: size, downstream_count (one per line)
Test Results
Cut Point (β=1000): -
Cut Point (β=10000): -
Maximum Efficiency: -
Steepness Factor: -
Filter Rating: -
Test Validity: -
Efficiency Curve
Cut Point Testing Guidelines
Beta Ratio (β)

The beta ratio is defined as the ratio of upstream to downstream particle count at a specific size:

β = Nupstream / Ndownstream

  • β = 1000: 99.9% efficiency
  • β = 10000: 99.99% efficiency
Test Standards
  • ISO 16889 - Multi-pass method
  • ASTM F795 - Pore size rating
  • ASTM F838 - Bacterial retention
  • ISO 4003 - Pressure drop
Key Parameters
  • Particle size distribution
  • Flow rate consistency
  • Pressure stability