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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

  • Product 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.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 87% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameLAB SAFETY SUPPLY
Product 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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