Whatman™ Qualitative Cellulose Filter Paper

Grade 114

20-25 µm. Half the thickness of Grade 113, this is a very strong filter with a smooth surface for easy recovery of precipitates. It is suitable for coarse or gelatinous precipitates. Also available prepleated as Grade 114V.

Qualitative Filter Circles Folded (Pleated) Grade 2V

8 µm. Widely used for general purpose filtration. Slightly more retentive than No. 1. Has excellent particle retention and a good filtration speed and loading capacity.

Qualitative Filter Circles Folded (Pleated) Grade 113V

30 µm. Very thick and strong filter with creped surface for extremely high loading capacity, particularly in folded form. Fastest flow rate of any qualitative grade. Ideal for coarse particles and gelatinous precipitates.

Qualitative Filter Circles Folded (Pleated) Grade 114V

25 µm. Strong filter with very fast flow rate. Ideal for coarse particles and gelatinous precipitates. Smooth surface.

Qualitative Standard Filter Sheets

Grade 1

11µm - a medium retention and flow rate filter for routine applications, including soil analysis and seed testing procedures, food industry testing, air pollution monitoring and gas detection.

Grade 2

8 µm. More absorbent and slightly more retentive with a slower filtration speed than Grade 1. Available prepleated as Grade 2V. Used for monitoring specific contaminants in the atmosphere and in soil testing.

Grade 3

6 µm. A thick filter with good loading capacity, fine particle retention and increased strength. The extra thickness gives increased wet strength and makes the filter suitable for use in Büchner funnels. The high absorbency is particularly valuable when the filter is used as a sample carrier.

Grade 4

20-25 µm. High flow rate with good retention of larger particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Also used as a rapid filter for routine cleanup of biological fluids or organic extracts and for rapid air pollution monitoring where collection of fine particles is not critical.

Grade 5

2.5 µm. The most efficient qualitative filter. Used for collecting small particles and has a slow flow rate. Suitable for chemical analysis clarifying cloudy suspensions and for water and soil analysis.

Grade 6

3 µm. Twice as fast as Grade 5 with similar particle retention. Often specified for boiler water analysis.

Grade 91

>10 µm. A general-purpose crêped filter for less critical routine analysis. Widely used to assay sucrose in cane sugar and in pharmaceutical laboratories for routine filtration.

Student Grade/Grade 93

>10 µm. Widely used in universities, colleges and schools for general laboratory filtration and coarse sample preparation. Available in a dispenser pack, which can be attached to the wall, placed on a shelf either upright or flat and used as a normal carton. Each dispenser pack contains 50 envelopes of 25 circles each.

Grade 113

30 µm. A creped filter with high loading capacity and the fastest flow rate of any qualitative grade. This is the thickest filter in the range and is extremely strong. Grade 113 is ideal for use with coarse or gelatinous precipitates. It is available prepleated as Grade 113V.