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White cellulose filter paper discs, 11 cm diameter, pack of 100

Lab Safety Supply Inc

Lab Safety Supply Inc 12K917 Qualitative Filter Paper 11.0cm PK100

SKU CH-WSC4-EMBFS

Pack of 100 cellulose filter paper discs, 11 cm diameter, 25 micron pore size, 0.21 mm thick, FDA grade 4 for gas and liquid filtration

  • TypeGround Fault and Current Leakage Testers
  • Qualitative Grade 4 cellulose paper for reliable lab filtration
  • 0 cm diameter discs fit standard funnels and holders
  • Fast porosity with 25 micron pores speeds liquid processing
  • 21 mm thickness gives consistent flow and handling
  • Pack of 100 discs supports high-volume testing workflows

Qualitative Filter Paper 11 cm Diameter

This qualitative filter paper comes in 11 cm diameter discs made from cellulose with a uniform 25 micron pore size. The pack contains 100 discs graded as Grade 4 with fast porosity and a thickness of 0.21 mm. They are designed for general laboratory filtration of gases and liquids and meet FDA standards.

Suitable for Routine Lab Filtration Not for Fine

These discs suit technicians and students who need fast-flow qualitative filtration for routine separations and sample preparation. The consistent 25 micron rating handles typical precipitates and clarifications. Labs requiring finer particle retention, quantitative ashless analysis, or membrane-level sterility assurance should select a different grade or membrane type.

Consistent Flow During Extended Filtration

The uniform pore structure maintains steady flow rates throughout prolonged gravity or vacuum filtrations without rapid blinding. Cellulose construction resists disintegration when wet, so the discs hold together during long runs with large sample volumes. Fast porosity ensures throughput remains practical even as the filter loads with retained solids.

Highlights

  • Qualitative Grade 4 cellulose paper for reliable lab filtration
  • 0 cm diameter discs fit standard funnels and holders
  • Fast porosity with 25 micron pores speeds liquid processing
  • 21 mm thickness gives consistent flow and handling
  • Pack of 100 discs supports high-volume testing workflows

Specifications

BrandLAB SAFETY SUPPLY
TypeGround Fault and Current Leakage Testers

Questions about this item

What funnel or holder diameter do I need for the 11.0 cm discs?

Use a funnel or filter holder with an 11 cm internal diameter so the cellulose discs sit flat without folding.

Can I keep using my existing glass funnel with these Grade 4 cellulose discs?

Yes, the 11 cm discs fit standard 11 cm glass or plastic funnels; the 25 µm pores and 0.21 mm thickness work with existing gravity setups.

How do I confirm the pack performs to the stated 25 µm pore size after opening?

Filter a known particle suspension; the filtrate should be clear and the residue retained on the 0.21 mm thick cellulose disc, matching the fast porosity rating.

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