Qualitative standard filter paper

Whatman™  Grade 1 Qualitative Filter Papers are the most widely used filter paper for routine laboratory applications, qualitative analytical separations, and clarifying liquids. They are the standard grade cellulose filter papers for medium flow rates.

Ultra high loading capacity with a particle retention well suited for use with coarse or gelatinous precipitates. Fastest flow rate of the qualitative grades. Creped surface. Thickest filter paper in the qualitative range.

Only half the thickness of Grade 113 and suitable for coarse or gelatinous precipitates. Smooth surface for easy recovery of precipitates.

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

Whatman™ Grade 2 qualitative filter papers have a particle retention of 8 µm, slightly more retentive than Grade 1, and with an equivalent increase in filtration time. The filters are tested according to the procedure detailed in ASTM E 2187-09, Sections 9.3.1 and 9.3.2. The paper meets both the conditioned (26.1 ± 0.5 g, SD < 0.3 g) and dried (24.7 ± 0.5 g, SD < 0.3 g) weight requirements.

A general qualitative filter for less critical routine analysis. Widely used in industrial laboratories and students laboratories for routine filtration.

A general qualitative filter with creped surface. Faster than grade 201 and retain large crystalline coarse particles. Widely used in industrial laboratories and students laboratories for routine filtration.

A general qualitative filter with creped surface. High filtration speed, faster than grade 202 and retain coarse particles gelatinous precipitates.

A general qualitative filter with creped surface. High filtration speed and high loading capacity. Widely used in industrial laboratories and students laboratories for routine filtration.

A standard grade filter used in qualitative analytical techniques to determine and identify materials. For use in büchner funnels.

Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.

A standard grade clarifying filter excellent for cloudy suspensions and for water and soil analysis.

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).

Fast filter paper. Stated in a number of standards and methods [e.g., Aflatoxin determination in animal feed (BS 5766-7) and Mercury determination in sludge (EPA method 105)].

A standard grade filter for fast filtration of medium to coarse precipitates.