Ofite Filter Paper 3.5″ (9cm), 2.7um (100/pack)

Whatman #50 is the industry standard for filtration testing.

This filter paper is used in the API, Low Pressure Filter Presses. This filter paper meets the requirements established in API Recommended Practice 13B-1 and 13B-2.


  • Grade: Whatman #50
  • Type: Hardened low ash
  • Particle Retention in Liquid: 2.7 µm
  • Ash Content: 0.015%
  • Water Flow Rate: 10 mL/min
  • Nominal Thickness: 115 µm
  • Basis Weight: 96 g/m2
  • Nominal Air Flow Rate: 144 s/100 mL/in2
  • Diameter: 3.5″ (88.9 mm)
  • Thickness: 115 µm
  • Material: High-quality cotton linters
  • Alpha Cellulose Content Minimum: = 98%
  • Package of 100


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