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Wet Strengthened General Purpose Filter Papers

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Filter Papers

Wet Strengthened General Purpose Filter Papers

Wet strengthened grades

These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin. Their use in normal qualitative applications will not introduce any significant impurities into the filtrate. The resins do, however, contain nitrogen, so these grades should not be used in Kjeldahl estimations, etc. Some wet strengthened grades are available in folded (fluted) forms.

Product Info

Applications

Grade 91 (10 μm*)

A general purpose creped filter for less critical routine analysis. Widely used to assay sucrose in cane sugar and within pharmaceutical laboratories for routine filtration.

Grade 93 (10 μm*)

This filter paper is intermediate in speed and retention between Grades 1 and 4. Available in a dispenser pack, which can be attached to the wall or bench, placed on a shelf either upright or flat, and used as a normal carton or as a convenient dispenser. The envelopes are released individually for easy one at-a-time removal. Package and envelopes are clearly marked for size and content.

Grade 113 (30 μm*)

A fast, open filter paper with creped surface and high loading capacity — making it highly suited for use with coarse or gelatinous precipitates. Fastest flow rate of the qualitative grades. Also available as Grade 113V.

Grade 114 (25 μm*)

Half the thickness of Grade 113 and suitable for coarse or gelatinous precipitates. Smooth surface for easy recovery of precipitates. Also available fluted as Grade 114V.

Grade 1573 (12–25 μm*)

A fast filter paper with high wet strength. It has a very smooth surface, making it easy to scrape or wash off precipitate. Resistant against: sulfuric and nitric acid solutions (up to 40% at 50°C), hydrochloric (up to 10% at 100°C, 20% at 60°C, 25% at 20°C) and alkalis (up to 10% at 20°C). Also available fluted as Grade 1573 ½.

Grade 1574 (7–12 μm*)

A medium fast filter paper with high wet strength. This paper has the same chemical resistance characteristics as Grade 1573 (see above). Available fluted as Grade 1574 ½.

Grade 1575 (< 2 μm*)

Slow filter paper with high wet strength. This paper has the same chemical resistance characteristics as Grade 1573 (see above).

* Particle retention rating at 98% efficiency

Check out the price

Whatman™ Price List 2021

Cat. Nos DescriptionMRP INR
1091-110 GR 91 11.0CM 4000/PK 40340
1091-125 GR 91 12.5CM 4000/PK 46790
1091-150 GR 91 15CM 1000/PK 18320
1091-165 GR 91 16.5CM 1000/PK 19130
1091-185 GR 91 18.5CM 1000/PK 22710
1091-190 GR 91 19CM 1000/PK 41720
1091-240 GR 91 24CM 4000/PK 35730

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