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.
ProSource Scientific Grade 1 Qualitative Filter Papers - 11μm
The most widely used filter paper. Medium retention and flow rate. Extended range of circle sizes from 2 to 50cm in diameter. Sheets and strips also available.
ProSource Scientific Grade 2 Qualitative Filter Papers - 8μm
More absorbent and slightly more retentive than PS001 with a corresponding slower filtration speed.
ProSource Scientific 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.
ProSource Scientific Grade 40 Ashless Quantitative Filter Papers - 8μm
General purpose ashless filter with medium speed and particle retention. Applications include gravimetric analysis, the filtration of solutions prior to atomic absorption spectrophotometry and in air pollution monitoring.
ProSource Scientific Grade 41 Ashless Quantitative Filter Papers - 20μm
The fastest ashless filter, recommended for analytical procedures involving large particles or gelatinous precipitates such as iron or aluminium hydroxides. Used in quantitative air pollution analysis for determining gaseous compounds at high flow rates.
ProSource Scientific Grade 42 Ashless Quantitative Filter Papers - 2.5μm
A moderatly fast filter with the finest particle retention of all cellulose filters. Typical analytical precipitates include barium sulphate, metastannic acid and finely precipitated calcium carbonate.
ProSource Scientific Grade 54 Hardened Low Ash Quantitative Filter Papers - 22μm
The general purpose hardened ashless filter paper, with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali.
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.
