Whatman Grade 1 Qualitative Filter Paper covers a wide range of laboratory applications, frequently used for clarifying liquids. It is widely used in education for teaching simple qualitative analytical separations.
Whatman Glass Microfiber Filters offers fine particle retention and high flow rate, as well as good loading capacity. Grade GF/A is used for high-efficiency general purpose laboratory filtration, including water pollution monitoring of effluents, for filtration of water, algae and bacteria cultures, foodstuff analyses, protein filtration and radio immuno assay of weak ß emitters.
High-purity glass microfiber thimbles manufactured from 1% pure borosilicate glass are available for specialized applications. The thimbles are completely free of binders or additives and can be used at temperatures up to 500 degrees C or when using solvents that are incompatible with cellulose thimbles.
Whatman Plain Cellulose Nitrate Membrane Filters have excellent flexibility and low level of extractables to ensure sample integrity. The narrow pore size distribution of these filters provide for improved surface capture and analysis.
Whatman Grade 540 is a high-purity, acid-treated cellulose lab filter paper. Mechanically strong Grade 540 is well suited for quantitative or gravimetric analysis of strongly acidic or alkaline samples.