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Qualitative Filter Papers - Folded (Prepleated Grades)
Home | Filter Papers | Cellulose Filters | Qualitative Filter Papers - Folded (Prepleated Grades)

Time-saving Whatman qualitative grades are offered in this convenient form, which have major advantages over flat circles:
 
  • 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 because more filter area is available
  • Maintained flow rate because of the reduction in filter paper contact with funnel side and, of course, 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


Grade 2V: 8 µm
Widely used for general purpose filtration. Has excellent particle retention and a good filtration speed and loading capacity. Also available in flat stock form as Grade 2.

Grade 5V: 2.5 µm
The maximum degree of fine particle filtration in the qualitative range. Capable of retaining the fine precipitates encountered in chemical analysis. Slow flow rate. Excellent clarifying filter for cloudy suspensions and for water and soil analysis. Also available in flat stock form as Grade 5.

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. Also available in flat stock form as Grade 113.

Grade 114V: 25 µm
Strong filter with very fast flow rate. Ideal for coarse particles and gelatinous precipitates. Smooth surface. Also available in flat stock form as Grade 114.

Grade 287 ½
Kieselguhr paper with a medium to slow flow rate. 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.

Grade 520 a ½: 15-18 µm
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). Also available in flat stock form as Grade 520 a.

Grade 520 bII ½: 15-19 µm
A thick paper with high wet strength offering a very high flow rate. Also available in flat stock form as Grade 520 bII.

Grade 588 ½
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). Also available in flat stock form as Grade 588.

Grade 591 ½: 7-12 µm
A thick filter paper with very high loading capacity for fast filtration of medium to coarse precipitates. Offers high absorbency and increased wet strength. Also available in flat stock form as Grade 591.

Grade 595 ½: 4-7 µm
Very popular, thin filter paper, medium-fast with medium to fine particle retention. Used for many routine analytical applications in different industries (e.g., particle separation from food extracts or filtration of solids from digested environmental samples, e.g. for ICP/AAS analysis). Also available in flat stock form as Grade 595.

Grade 597 ½: 4-7 µm
A medium fast filter paper with medium to fine particle retention. Used for a wide variety of analytical routine applications in different industries like food testing (e.g. determination of fat content acc. to Section 35 LMBG*) or removal of carbon dioxide and turbidity from beverages (e.g. beer analysis acc. to EBC or MEBAK). Also available in flat stock form as Grade 597.
* German law for food and consumer products

Grade 598 ½: 8-10 µm
A thick filter paper with high loading capacity. Combines medium retention with medium-fast to quick filtration speed. Also available in flat stock form as Grade 598.

Grade 602 h ½: < 2 µm
A dense filter paper for collecting very small particles and removing fine precipitates. Used in sample preparation,
e.g. in the beverage industry for residual sugar determination, acidic spectra, refractometric analysis and HPLC. Also available in flat stock form as Grade 602 h.

Grade 0858 ½: 7-12 µm
Grained, with medium fast flow rate and medium retention. A universal filter paper, used for the filtration of extracts, oils, beer, syrups etc., also applied in filter presses or for the aspiration of liquids. Available flat stock form as Grade 0858.

Grade 0860 ½: 12 µm
Comparable to Grade 0858 but with a smooth surface, slightly thinner and faster. Also available flat stock form as Grade 0860.

Grade 0905 ½: 12-25 µmA creped paper for coarsed particles, offers a very high filtration speed. Available flat stock as Grade 0905

Grade 1573 ½: 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), alkalis (up to 10% at 20° C). Also available in flat stock form as Grade 1573.

Grade 1574 ½: 4-12 µm
A medium fast filter paper with high wet strength. This paper has the same chemical resistance characteristics as Grade 1573 (see under Grade 1573 above). Also available in flat stock form as Grade 1574.

Grade 2555 ½
A medium fast filter paper. Used for the filtration of the mash for the determination of the extract in malt and wort acc. to the EBC* and for removing carbon dioxide from beer.
* German law for food and consumer products

Typical Properties - Qualitative Folded Grades
Grade Description Particle
Retention
in Liquid (µm)		 Filtration Speed
(approx.)
Herzberg (s)		 Typical
Thickness
(µm)		 Basis Weight
(g/m2)
2V Medium Flow 8* 240 190 103
5V Slow 2.5* 1420 200 98
113V Fast, Creped 30* 28 420 125
114V Fast, Smooth 25* 38 190 77
287 ½ Kieselguhr - - 650 154
520 a ½ Very Fast, Creped,
High Wet Strength		 15-18** 35 320 90
520 bII ½ Very Fast, Creped,
Wet Strength, Thick		 15-19** 30 530 135
588 ½ Fast - - 205 80
591 ½ Medium Fast, Thick 7-12** 45 360 165
595 ½ Medium Fast, Thin 4-7** 80 160 68
597 ½ Medium Fast 4-7** 70 190 85
598 ½ Medium Fast, Thick 8-10** 50 320 140
602 h ½ Slow, Dense < 2** 750 150 85
598 ½ Medium Fast, Thick 8-10** 50 320 140
602 h ½ Slow, Dense < 2** 750 150 85
0858 ½ Medium Fast, Grained 7-12** 55 210 75
0860 ½ Medium Fast, Smooth 7-12** 60 180 75
0905 ½ Very Fast, Creped 12-25** 40 270 75
1573 ½ Fast, Smooth 12-25** 50 170 90
1574 ½ Medium Fast, Very Low
Fiber Release		 7-12** 170 160 90
2555 ½ Medium Fast 7-12** 55 170 75


*  Particle Retention Rating at 98% efficiency    
** Approximate values 
Ordering Information - Qualitative Filter Papers - Folded (Prepleated Grades)
Catalog Number Description

Grade 2V
1202-125 Grade 2V Folded Filters, 125 mm 100/pk
1202-150 Grade 2V Folded Filters, 150 mm 100/pk
1202-185 Grade 2V Folded Filters, 185 mm 100/pk
1202-240 Grade 2V Folded Filters, 240 mm 100/pk
1202-270 Grade 2V Folded Filters, 270 mm 100/pk
1202-320 Grade 2V Folded Filters, 320 mm 100/pk
1202-385 Grade 2V Folded Filters, 385 mm 100/pk
1202-400 Grade 2V Folded Filters, 400 mm 100/pk
1202-500 Grade 2V Folded Filters, 500 mm 100/pk

Grade 5V
1205-185 Grade 5V Folded Filters, 185 mm 100/pk

Grade 113V
1213-125 Grade 113V Folded Filters, 125 mm 100/pk
1213-150 Grade 113V Folded Filters, 150 mm 100/pk
1213-185 Grade 113V Folded Filters, 185 mm 100/pk
1213-240 Grade 113V Folded Filters, 240 mm 100/pk
1213-270 Grade 113V Folded Filters, 270 mm 100/pk
1213-320 Grade 113V Folded Filters, 320 mm 100/pk
1213-500 Grade 113V Folded Filters, 500 mm 100/pk

Grade 114V
1214-125 Grade 114V Folded Filters, 125 mm 100/pk
1214-150 Grade 114V Folded Filters, 150 mm 100/pk
1214-185 Grade 114V Folded Filters, 185 mm 100/pk
1214-240 Grade 114V Folded Filters, 240 mm 100/pk
1214-320 Grade 114V Folded Filters, 320 mm 100/pk

Grade 287 ½
10310244 Grade 287 1/2 Folded filters, 125 mm 50/pk
10310245 Grade 287 1/2 Folded filters, 150 mm 50/pk
10310247 Grade 287 1/2 Folded filters, 185 mm 50/pk
10310251 Grade 287 1/2 Folded filters, 240 mm 50/pk
10310253 Grade 287 1/2 Folded filters, 320 mm 50/pk

Grade 520 a  ½
10331451 Grade 520 a 1/2 Folded Filters, 240 mm 100/pk
10331456 Grade 520 a 1/2 Folded Filters, 500 mm 100/pk
10331459 Grade 520 a 1/2 Folded Filters, 700 mm 100/pk

Grade 520 bII ½
10331653 Grade 520 bII 1/2 Folded Filters, 320mm 50/pk

Grade 588 ½
10319352 Grade 588 1/2 Folded Filters, 270mm 100/pk

Grade 591 ½
10311347 Grade 591 1/2 Folded filters, 185 mm 50/pk
10311351 Grade 591 1/2 Folded filters, 240 mm 50/pk

Grade 595 ½
10311641 Grade 595 1/2 Folded filter, 70 mm 100/pk
10311642 Grade 595 1/2 Folded filter, 90 mm 100/pk
10311643 Grade 595 1/2 Folded filters, 110 mm 100/pk
10311644 Grade 595 1/2 Folded filters, 125 mm 100/pk
10311645 Grade 595 1/2 Folded filters, 150 mm 100/pk
10311647 Grade 595 1/2 Folded filters, 185 mm 100/pk
10311649 Grade 595 1/2 Folded filter, 210 mm 100/pk
10311651 Grade 595 1/2 Folded filters, 240 mm 100/pk
10311652 Grade 595 1/2 Folded filters, 270 mm 100/pk
10311653 Grade 595 1/2 Folded filters, 320 mm 100/pk
10311654 Grade 595 1/2 Folded filter, 385 mm 100/pk
10311656 Grade 595 1/2 Folded filter, 500 mm 100/pk

Grade 597 ½
10311841 Grade 597 1/2 Folded filters, 70 mm 100/pk
10311842 Grade 597 1/2 Folded filters, 90 mm 100/pk
10311843 Grade 597 1/2 Folded filters, 110 mm 100/pk
10311844 Grade 597 1/2 Folded filters, 125 mm 100/pk
10311845 Grade 597 1/2 Folded filters, 150 mm 100/pk
10311847 Grade 597 1/2 Folded filters, 185 mm 100/pk
10311851 Grade 597 1/2 Folded filters, 240 mm 100/pk
10311852 Grade 597 1/2 Folded filters, 270 mm 100/pk
10311853 Grade 597 1/2 Folded filters, 320 mm 100/pk
10311854 Grade 597 1/2 Folded filters, 385 mm 100/pk
10311856 Grade 597 1/2 Folded filters, 500 mm 100/pk

Grade 598 ½
10312244 Grade 598 1/2 Folded filters, 125 mm 50/pk
10312247 Grade 598 1/2 Folded filters, 185 mm 50/pk
10312251 Grade 598 1/2 Folded filters, 240 mm 50/pk
10312256 Grade 598 1/2 Folded filters, 500 mm 50/pk

Grade 602 h ½
10312642 Grade 602 h 1/2 Folded filters, 90 mm 100/pk
10312644 Grade 602 h 1/2 Folded filters, 125 mm 100/pk
10312645 Grade 602 h 1/2 Folded filters, 150 mm 100/pk
10312647 Grade 602 h 1/2 Folded filters, 185 mm 100/pk
10312651 Grade 602 h 1/2 Folded filters, 240 mm 100/pk

Grade 0858 ½
10334345 Grade 0858 1/2 Folded Filters, 150 mm 100/pk
10334347 Grade 0858 1/2 Folded Filters, 185 mm 100/pk
10334351 Grade 0858 1/2 Folded Filters, 240 mm 100/pk
10334352 Grade 0858 1/2 Folded Filters, 270 mm 100/pk
10334353 Grade 0858 1/2 Folded Filters, 320 mm 100/pk

Grade 0860 ½
10334547 Grade 0860 1/2 Folded Filters, 185 mm 100/pk
10334551 Grade 0860 1/2 Folded Filters, 240 mm 100/pk
10334553 Grade 0860 1/2 Folded Filters, 320 mm 100/pk

Grade 0905 ½
10334953 Garde 0905 1/2 Folded Filters, 320 mm 100/pk

Grade 1573 ½
10314744 Grade 1573 1/2 Folded filters, 125 mm 100/pk
10314745 Grade 1573 1/2 Folded filters, 150 mm 100/pk
10314747 Grade 1573 1/2 Folded filters, 185 mm 100/pk
10314751 Grade 1573 1/2 Folded filters, 240 mm 100/pk
10314752 Grade 1573 1/2 Folded filters, 270 mm 100/pk
10314753 Grade 1573 1/2 Folded filters, 320 mm 100/pk
10314756 Grade 1573 1/2 Folded filters, 500 mm 100/pk

Grade 1574 ½
10314844 Grade 1574 1/2 Folded filters, 125 mm 100/pk
10314847 Grade 1574 1/2 Folded filters, 185 mm 100/pk

Grade 2555 ½
10313947 Grade 2555 1/2 Folded filters, 185 mm 100/pk
10313951 Grade 2555 1/2 Folded filters, 240 mm 100/pk
10313953 Grade 2555 1/2 Folded filters, 320 mm 100/pk

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