Grade 520 a ½ Qualitative Filter Paper Folded (Prepleated)

A thin paper with great wet strength and a very high flow rate. Frequently used in technical applications such as the filtration of viscous liquids and emulsions (e.g., sweetened juices, spirits and syrups, resin solutions, oils, or plant extracts).

• 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 520 a ½: 15-18µm

Specifications:

• Grade: Grade 520 a ½
• Grade Type: Folded (Prepleated)
• Particle Retention in Liquid Max.: 18 µm
• Typical Thickness: 300 µm
• Basis Weight: 90g/m²
• Filtration Speed (Herzberg): Approx. 17.5s
• Material: Cellulose
• Alpha Cellulose Content Min.: 98%
• Properties: Very fast, creped, high wet strength

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