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White cellulose filter paper discs 12.5cm diameter pack of 100

Lab Safety Supply Inc

Lab Safety Supply Inc 12K904 Qualitative Filter Paper 12.5cm 8um PK100

SKU CH-E03T-A2V4W

Qualitative cellulose filter paper discs, 12.5 cm diameter with 8 micron pore size, supplied in a pack of 100

  • TypeGround Fault and Current Leakage Testers
  • 8 µm pore size retains fine particles during filtration
  • Cellulose construction handles gases and liquids without degrading
  • Medium-slow flow rate allows thorough separation of precipitates
  • 17 mm thickness resists tearing under vacuum pressure
  • 100 discs per pack supports high-volume laboratory workflows

Qualitative Filter Paper 12.5 cm Discs

This qualitative filter paper comes as 12.5 cm diameter discs made from cellulose. The medium-slow porosity and 8 micron pore size suit gravity filtration of gases and liquids in laboratory workflows. Each pack contains 100 discs for routine analytical tasks.

Replaces slower or coarser filter grades

Switching from a faster or larger-pore grade is worthwhile when finer particle retention is needed without moving to vacuum-assisted hardware. The Grade 2 rating indicates a balance of flow rate and clarity for standard qualitative separations. It does not meet quantitative ashless requirements.

Limited by gravity flow and pore uniformity

The 0.17 mm thickness and fixed 8 micron pores restrict throughput on viscous or high-solids samples. Gravity-driven filtration cannot be accelerated without risking breakthrough or media rupture. The discs are not fluted, so surface area remains flat and uncreased.

Highlights

  • 8 µm pore size retains fine particles during filtration
  • Cellulose construction handles gases and liquids without degrading
  • Medium-slow flow rate allows thorough separation of precipitates
  • 17 mm thickness resists tearing under vacuum pressure
  • 100 discs per pack supports high-volume laboratory workflows

Specifications

BrandLAB SAFETY SUPPLY
TypeGround Fault and Current Leakage Testers

Questions about this item

Will the 12.5 cm disc sit flat in a standard Büchner funnel?

The disc is 12.5 cm in diameter and 0.17 mm thick with no fluting so it sits flat in any funnel that accepts that size

Do I need to wet the cellulose disc before pouring the slurry or can I pour dry?

Wet the disc with a few millilitres of the filtrate first; pouring slurry onto dry cellulose often traps air and slows the 8 µm flow

How many 12.5 cm discs come in the pack and when should I swap a used one?

The pack contains 100 discs; replace a disc when flow drops noticeably or the cake builds up past the 8 µm pore rating

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