Filtry jakościowe Grade 287 1/2

Filtry fałdowane z ziemią okrzemkową o średnim do wolnego przepływie i dodatkowym efekcie adsorpcyjnym.
Kieselguhr prepleated paper with a medium to slow flow rate and additional adsorption effect.

• Savings in time required to quadrant-fold circles to fit conical filter funnels in repetitive or multiple analyses.
• 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 as more filter area is available.
• Maintained flow rate due to the reduction in filter paper contact with funnel side and 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.

Time-saving Whatman qualitative grades are offered in this convenient form, which gives major advantages over flat circles.

Grade 287 1/2
Additional adsorption effect e.g. for the separation of very fine semi-colloidal turbidity, for clarifying milk serum, starch solutions, soil suspensions or sugar-containing solutions prior to polarimetry or refractometry. Also available in flat stock form as Grade 287.

Product 10310244: Discontinued. No new products will be manufactured after 30th September 2017. No alternative is available.
Grade Grade 287 1/2 
Grade Type Folded (Prepleated) 
Typical Thickness 360 µm
Basis Weight 154 g/m2
Filtration Speed (Herzberg) Approx. 330 s
Properties Kieselguhr 
Application For clarifying milk serum; starch solutions; soil suspensions or sugar-containing solutions prior to polarimetry or refractometry 
Product Product Name Diameter
10310244 Grade 287 1/2 Qualitative Filter Paper Folded (Prepleated); 125 mm 125 mm
10310245 Grade 287 1/2 Qualitative Filter Paper Folded (Prepleated); 150 mm 150 mm
10310247 Grade 287 1/2 Qualitative Filter Paper Folded (Prepleated); 185 mm 185 mm