International Shipping

We do not offer international shipping to countries within the European Union

We can only ship non-hazardous products to Rest of World

Wet-strengthened Qualitative Filter Paper, 322 Grade, 55mm - 320mm

Wet-strengthened Qualitative Filter Paper, 322 Grade, 55mm - 320mm
Price: £5.95
Stock Availability:

Compare all Pack Sizes

Stock Availability
On Shelf - Approx. UK delivery date: Thursday the 19th February 2026*
In bulk stock - ships within 10 - 12 Working Days (Excluding weekends and public holidays)
4 to 6 weeks approx. (Not guaranteed)
UK Shipping

Unfortunately, we are not currently accepting orders for Northern Ireland, Jersey and Guernsey.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed
  • Educational labs and training environments
  • Filtration of chemical precipitates in industrial settings
  • Acidic or alkaline sample filtration
  • Use with Buchner funnels for vacuum filtration
  • Applications requiring post-filtration residue recovery

Wet-strengthened filter papers are manufactured from a majority of alpha-cellulose. The smooth surface allows for fibre-free filtration. They feature a high wet strength and can also be used in the filtration of strong alkaline or acid solutions. Due to their high mechanical strength, they are suited to applications where the residue is removed from the filter, for example with a spatula or a jet of water.

Grade 322: is a medium-filtering wet-strengthened paper with reliable retention and mechanical durability. Commonly used in student laboratories, it also performs well in general-purpose applications requiring robust handling. Its strength makes it particularly suitable for use in Buchner funnels and for filtering precipitates such as barium carbonate, lead chromate, and beryllium hydroxide.

Application: Economical filter paper used in schools and as bench protective paper

Key Features

Wet Strength
Reinforced for use with spatulas, water jets, or filtration involving acids and alkalis.​

Medium Filtration Speed
Balanced flow rate with consistent particle retention, suitable for routine use.​

Durable and Versatile
Performs well in both educational and industrial lab environments.​

Buchner Funnel Compatibility
Strong enough for vacuum-assisted filtration without tearing.​

Precipitate Filtration
Used for a range of common precipitates, especially where residue recovery is required.

Available Grades

GradeWhatman EquivalentSpeedThickness (mm)Pore Size (μM)Weight (g/m²)Filtration Speed (sec*)Burst Strength (kg/cm²)
322 = No.93 Fast Filtration 0.15 10-20 64 50 1.45
323 = No.91 Fast Filtration 0.14 20-30 64 30 1.6
324 = No.113 Fast, creped 0.45 45-65 140 14 1.8
325 = No.114 Very Fast Filtration 0.17 17-30 73 22 1.25

Payment Methods

We can also accept a bank transfer (UK Only)

Source Chemicals Ltd