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White cellulose filter paper discs 18.5 cm diameter 25 micron pore size pack of 100

Lab Safety Supply Inc

Lab Safety Supply Inc 12K924 Qual Filter 18.5 cm 25 mic PK100

SKU CH-588H-5Q04T

Qualitative cellulose filter discs, 18.5 cm diameter with 25 micron pore size, supplied in packs of 100

  • TypeGround Fault and Current Leakage Testers
  • Fast filtration with 25 micron pore size
  • 5 cm diameter fits standard funnels
  • 21 mm thickness ensures strength
  • Pack of 100 supports high-volume labs
  • FDA-compliant cellulose for regulated work

Filter paper for gas and liquid analysis

This qualitative filter paper is designed for laboratory filtration of gases and liquids. The cellulose discs measure 18.5 cm in diameter with a uniform 25 micron pore size. Each pack contains 100 discs suitable for routine qualitative separation tasks.

Fast porosity and thin profile for efficient flow

The fast porosity grade allows rapid liquid passage while retaining particles at the 25 micron threshold. At 0.21 mm thick, the discs add minimal resistance to vacuum or gravity filtration setups. The flat disc shape fits standard funnel holders without fluting.

FDA-listed material for regulated environments

Grade 4 cellulose meets FDA standards for contact with regulated samples. The consistent pore structure supports reproducible results across the 100-disc pack. Labs needing finer retention or ashless grades will require a different specification.

Highlights

  • Fast filtration with 25 micron pore size
  • 5 cm diameter fits standard funnels
  • 21 mm thickness ensures strength
  • Pack of 100 supports high-volume labs
  • FDA-compliant cellulose for regulated work

Specifications

BrandLAB SAFETY SUPPLY
TypeGround Fault and Current Leakage Testers

Questions about this item

How do I fit the 18.5 cm disc into my funnel without tearing the 0.21 mm cellulose?

Place the flat disc smoothly into a clean, dry funnel that matches the 18.5 cm diameter; wet it gently with the filtrate so it adheres without stretching the thin Grade 4 paper.

When should I replace a filter during a long filtration run?

Swap in a fresh disc from the 100-pack as soon as flow slows or the 25 micron pores clog; each disc is single-use and cannot be cleaned or reused.

What stops me from stacking multiple discs to speed up a large volume?

The 0.21 mm thickness and fast porosity are calibrated for one layer; stacking raises back-pressure and can force particles through the 25 micron rating.

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