Whatman^® qualitative filter paper, folded (prepleated grades)

Time-saving Whatman qualitative grades are offered in this convenient form (folded, prepleated grades) which have major advantages over flat circles.

• Savings in time required to quadrant-fold circles to fit conical filter funnels in repetitive or multiple analysis
• Decreased overall filtration time because of the extra surface area exposed; the normal slow down of filtration speed due to the loading of particulate is postponed
• Increased total loading capacity because more filter area is available
• Maintained flow rate because of the reduction in filter paper contact with funnel side and, of course, the self-supporting shape of the filter itself
• The prepleating does not significantly affect any of the technical data and the same figures may be used for the flat circles

Grade 595 ½: 4-7 μm
Very popular, thin filter paper, medium-fast with medium to fine particle retention. Used for many routine analytical applications in different industries (e.g., particle separation from food extracts or filtration of solids from digested environmental samples, e.g., for ICP/AAS analysis).

Grade 597 ½: 4-7 μm
A medium fast filter paper with medium to fine particle retention. Used for a wide variety of analytical routine applications in different industries like food testing (e.g., determination of fat content) or removal of carbon dioxide and turbidity from beverages (e.g., beer analysis).

Grade 602 h ½: <2 μm
A dense filter paper for collecting very small particles and removing fine precipitates. Used in sample preparation, e.g., in the beverage industry for residual sugar determination, acidic spectra, refractometric analysis, and HPLC.

Whatman is a registered trademark of Cytiva