Cellulose Filter Papers

Whatman filter papers are world-renowned as the standard for laboratory filtration and are associated with quality, reliability, and customer service. The familiar Whatman Blue Box is the laboratory benchmark for filtration. Papermaking skills have been developed to the highest level, with the expertize and technology to manufacture innovative multilayer materials.

Whatman offers an extensive line of filter papers. The innovative features of these filters make them the optimum choice for many filtering techniques. Whatman maintains a guaranteed quality, reproducibility, and uniformity for all its filters by using only the highest-quality raw materials. The filters are tested for basic weight, thickness, air flow, and mechanical strength.  In addition, special parameters such as particle retention, wicking rate, filtration performance, and surface characteristics can be measured as needed.

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ProSource Scientific Grade 54 Hardened Low Ash Quantitative Filter Papers - 22μm

28% cheaper than Whatman Grade 54 Hardened Low Ash Quantitative Filter Papers!
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Whatman Grade 1 Qualitative Filter Papers - 11μm

The most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 42.5 mm to 500 mm diameter circles and 460 mm x 570 mm sheets.
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Whatman Grade 2 Qualitative Filter Papers - 8μm

Slightly more retentive and absorbent than Grade 1 with a corresponding increase in filtration time. In addition to general filtration in the 8µm particle size range, the extra absorbency can be utilized to hold soil nutrient in plant growth trials.
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Whatman Grade 2V Pre-Pleated Qualitative Filter Papers - 8μm

Widely used for general purpose filtration, the time-saving Whatman grade 2V qualitative grade is offered in this convenient pre-plated form. Has excellent particle retention and a good filtration speed and loading capacity.
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Whatman Grade 3 Qualitative Filter Papers - 6μm

Double the thickness of Grade 1 with still finer particle retention and excellent loading capacity; more precipitate can be held without clogging. The extra thickness gives increased wet strength and makes this grade suitable for use in Buchner funnels.
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Whatman Grade 4 Qualitative Filter Papers - 20-25μm

Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis.
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Whatman Grade 40 Ashless Quantitative Filter Papers - 8μm

The classic general purpose ashless filter paper with medium speed and retention, Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. 0.007% ash maximum.
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Whatman Grade 41 Ashless Quantitative Filter Papers - 20μm

The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides). 0.007% ash maximum.
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