Cellulose filters



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Qualitative filter papers



> Qualitative filters

Qualitative filter papers
These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increase loading capacity compared to equivalent flat filters.

In addition, Whatman offers wet strengthened qualitative filters which contain a small quantity of a chemically stable resin to give improved high wet strength. This does not introduce any significant impurities into the filtrate. The resin, however, does contain nitrogen so these grades should not be used in Kjedldahl. All wet-strengthened grades are available in prepleated forms. Whatman provides a wide range of Qualitative Filters to meet your specific needs.

Qualitative Filter Papers - Standard Grades

Grade 1: 11µm
The most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 10mm to 500mm diameter circles and 460mm x 570mm sheets. This filter is also available in the Whatman FilterCup™. This is a convenient, disposable 70mm filter funnel with a 250mL capacity moulded from polypropylene with an integral, heat bonded filter.

This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulphate, calcium oxalate (hot) and calcium carbonate.

In agriculture, it is used for soil analysis and seed testing procedures. In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.

In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and colour formation quantified by optical reflectance.

Grade 2: 8µm
Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. Also available in folded (prepleated) form as Grade 2V. In addition to general filtration in the 8µm particle size range, the extra absorbency is utilized, for example, to hold soil nutrient in plant growth trials. Also used for monitoring specific contaminants in the atmosphere and in soil testing.

Grade 3: 6µm
Double the thickness of Grade 1 with still finer particle retention and excellent loading capacity; more precipitate can be held without clogging. The extra thickness gives increased wet strength and makes this grade highly suitable for use in Büchner funnels. The high absorbency is particularly valuable when the paper is used as a sample carrier. This filter is also available in the Whatman FilterCup. This is a convenient, disposable 70mm filter funnel with a 250mL capacity moulded from polypropylene with an integral, heat bonded filter.

Grade 4: 20-25µm
Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminium hydroxide. Very useful as a rapid filter for routine cleanup of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Grade 5: 2.5µm
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.

Grade 6: 3µm
Twice as fast as Grade 5 with similar fine particle retention. Often specified for boiler water analysis applications.



> Wet Strengthened Filters

Qualitative 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. 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. All wet-strengthened grades are available in folded (prepleated) forms.

Grade 91: 10µm
A general-purpose crêped filter for less critical routine analysis. Widely used to assay sucrose in cane sugar and within pharmaceutical laboratories for routine filtration.

Grade 113: 30µm Ultra high loading capacity with a particle retention making it ideal for use with coarse or gelatinous precipitates. Fastest flow rate of the qualitative grades. Creped surface. Thickest filter paper in the Whatman range. This filter is also available in the Whatman FilterCup. This is a convenient, disposable 70mm filter funnel with a 250mL capacity moulded from polypropylene with an integral, heat bonded filter.

Grade 114: 25µm
Only half the thickness of Grade 113 and suitable for coarse or gelatinous precipitates. Smooth surface for easy recovery of precipitates.



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

Grade 113V: 30µm
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.

Grade 114V: 25µm
Strong filter with very fast flow rate. Ideal for coarse particles and gelatinous precipitates. Smooth surface.

Qualitative Filter Papers - Student Grade/Grade 93

Designed for educational use, this filter paper is intermediate in speed and retention between Grades 1 and 4. Student grade retains those flocculent and medium precipitates most often encountered in student experiments.

Available in a dispenser pack, it 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.

Standard Circle Filter Funnel Volumes
The maximum practical volume of the most popular disc sizes (quadrant folded) are:
Diameter (mm)	Volume (mL)
90	15
110	20
125	35
150	75
185	135
240	300

Ordering Information - Qualitative Standard Filter Circles
	Catalogue Number
Diameter (mm)	Grade 1	Grade 2	Grade 3	Grade 4	Grade 5	Grade 6	Quantity/Pack
10	1001-6508	—	—	—	—	—	500
23	—	—	1003-323	—	—	—	100
25	1001-325	—	—	1004-325	1005-325	—	100
30	1001-329	—	—	—	—	—	100
32	1001-032	—	—	—	—	—	100
42.5	1001-042	1002-042	1003-042	1004-042	1005-042	1006-042	100
47	1001-047	—	—	1004-047	1005-047	—	100
55	1001-055	1002-055	1003-055	1004-055	1005-055	—	100
70	1001-070	1002-070	1003-070	1004-070	1005-070	1006-070	100
85	1001-085	—	—	—	—	—	100
90	1001-090	1002-090	1003-090	1004-090	1005-090	1006-090	100
110	1001-110	1002-110	1003-110	1004-110	1005-110	1006-110	100
125	1001-125	1002-125	1003-125	1004-125	1005-125	1006-125	100
150	1001-150	1002-150	1003-150	1004-150	1005-150	1006-150	100
185	1001-185	1002-185	1003-185	1004-185	1006-185	1006-185	100
240	1001-240	1002-240	1003-240	1004-240	1006-240	1006-240	100
270	1001-270	1002-270	—	1004-270	—	—	100
320	1001-320	1002-320	1003-320	1004-320	1005-320	—	100
385	1001-385	1002-385	—	—	—	—	100
400	1001-400	—	—	1004-400	—	—	100
500	1001-500	1002-500	1003-500	—	—	—	100
FilterCup 70****	1600-001	—	1600-003	—	—	—	25

Ordering Information - Qualitative Wet Strengthened Filter Circles
	Catalogue Number
Diameter (mm)	Grade 91	Grade 93/Student	Grade 113	Grade 114	Quantity/Pack
90	—	—	1113-090	1114-090	100
110	1091-110*	1093-111**	1113-110	—	100
125	1091-125*	1093-126**	1113-125	1114-125	100
150	1091-150***	—	1113-150	1114-150	100
185	1091-185***	—	1113-185	1114-185	100
190	1091-190	—	—	—	100
240	1091-240***	—	1113-240	1114-240	100
270	—	—	—	1114-270	100
320	—	—	1113-320	—	100
400	—	—	—	1114-400	100
500	—	—	1113-500	—	100
FilterCup 70****	—	—	1600-113	—	25

* Packed in 4000 subdivided into 100.
** Packed in 50 envelopes of 25 circles each.
*** Packed in 1000 subdivided into 100.
**** FilterCup Stem with Stopper - one time purchase - Catalogue Number 1600-900

Ordering Information - Qualitative Filter Circles Folded (pleated)
	Catalogue Number
Diameter (mm)	Grade 2V	Grade 113V	Grade 114V	Quantity/Pack
125	1202-125	1213-125	1214-125	100
150	1202-150	1213-150	1214-150	100
185	1202-185	1213-185	1214-185	100
240	1202-240	1213-240	1214-240	100
270	1202-270	1213-270	—	100
320	1202-320	1213-320	1214-320	100
385	1202-385	—	—	100
400	1202-400	—	—	100
500	1202-500	1213-500	—	100

Ordering Information - Qualitative Standard Filter Sheets
Dimensions (mm)	Catalogue Number	Quantity/Pack
Grade 1
460 x 570	1001-917	100
460 x 570	1001-918	500
580 x 680	1001-931	100
Grade 2
460 x 570	1002-917	100
580 x 680	1002-931	100
Grade 3
460 x 570	1003-917	100
Grade 4
460 x 570	1004-917	100

Ordering Information - Qualitative Filter Paper
	Catalogue Number
Diameter (mm)	Grade 595	Grade 597	Grade 598	Grade 602 h	Quantity/Pack
12.7	—	10 311 862	—	—	1000
42.5	—	10 312 040	—	—	100
45	—	10 311 804	—	—	100
55	—	10 311 807	—	—	100
70	—	10 311 808	—	—	100
90	—	10 311 809	10 312 209	10 312 609	100
110	10 311 610	10 311 810	—	—	100
125	10 311 611	10 311 811	—	10 312 611	100
150	10 311 612	10 311 812	—	10 312 612	100
185	—	10 311 814	—	10 312 614	100
240	—	10 311 820	—	10 312 620	100
320	—	10 311 822	—	—	100
Diameter (mm)	Grade 520 a	Grade 2294	Grde 2589 a		Quantity/Pack
110	—	10 342 810	—		100
140	—	—	10 343 630		500
180 / 33 ZL¹	—	10 342 860	—		100
210 / 60 ZL¹	—	10 342 862	—		100
270	10 331 421	—	—		100
Diameter (mm)	Grade 0048	Grade 551	Grade 3612		Quantity/Pack
32	10 348 903	—	—		1000
90	—	10 310 809	—		100
240	—	—	10 341 420		100
¹Round filter with central hole

Ordering Information - Qualitative Folded (pleated) Filter Papers
	Catalogue Number
Diameter (mm)	Grade 520 a ½	Grade 595 ½	Grade 597 ½	Grade 602 h ½	Grade 2555 ½	Quantity/Pack
70	—	—	10 311 841	—	—	100
90	—	—	10 311 842	10 312 642	—	100
110	—	10 311 643	10 311 843	—	—	100
125	—	10 311 644	10 311 844	10 312 644	—	100
150	—	10 311 645	10 311 845	10 312 645	—	100
185	—	10 311 647	10 311 847	10 312 647	10 313 947	100
240	10 331 451	10 311 651	10 311 851	10 312 651	10 313 951	100
270	—	10 311 652	10 311 852	—	—	100
320	—	10 311 653	10 311 853	—	10 313 953	100
385	—	—	10 311 854	—	—	100
500	10 331 456	—	10 311 856	—	—	100
700	10 331 459	—	—	—	—	100
Diameter (mm)	Grade 591 ½	Grade 520 b II ½	Grade 598 ½	Grade 287 ½		Quantity/Pack
125	—	—	10 312 244	10 310 244		50
150	—	—	—	10 310 245		50
185	10 311 347	—	10 312 247	10 310 247		50
240	10 311 351	—	10 312 251	10 310 251		50
320	—	10 331 653	—	10 310 253		50
500	—	—	10 312 256	—		50

Ordering Information - Qualitative Filter Paper Sheets
	Catalogue Number
Dimensions (mm)	Grade 591	Grade 595	Grade 597	Grade 598	Grade 520 a	Grade 520 bII	Quantity/ Pack
580 x 580	—	—	10 311 897	—	—	—	100
580 x 580	10 311 387	—	—	10 312 287	10 331 487	10 331 681	250
580 x 580	—	10 311 687	10 311 887	—	—	—	500
Dimensions (mm)	Grade 2411	Grade 2589 a	Grade 2589 c	Grade 2589 d	Grade 0860		Quantity/Pack
580 x 580	—	10 343 687	—	—	10 334 597		100
580 x 580	10 343 287	—	—	—	—		200
25 x 75	—	—	10 343 876	10 343 976	—		100
Dimensions (mm)	Grade 0903	Grade 0905					Quantity/Pack
580 x 580	10 334 887	10 334 987					500
450 x 450	10 334 885	10 334 985					500

Ordering Information - Shark Skin Filters
Diameter (mm)	Catalogue Number	Quantity/Pack
110	10 347 510	100
150	10 347 513	100
290	10 347 577	100
320	10 347 530	100
812.8	10 347 576	100

Ordering Information - Shark Skin Filter Sheets
Dimensions (inches)	Catalogue Number	Quantity/Pack
8 x 10	10 538 877	100
26 x 53	10 347 588	500
32 x 64	10 347 530	500
37 x 37	10 538 873	500
21 x 750 feet	10 537 138	1

Quantitative filter papers



> Quantitative filters

Quantitative filter papers
Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.

	Ashless: 0.007% ash maximum - very pure filters ideal for a wide range of critical analytical filtration procedures.
	Hardened low ash: 0.015% ash maximum - treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.
	Hardened ashless: 0.006% ash maximum - acid hardened to give high wet strength and chemical resistance with extreme low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.

Quantitative Filter Papers - Ashless Grades (Ash 0.007%)

Grade 40: 8µm
The classic general purpose ashless filter paper with medium speed and retention. Typical applications include gravimetric analysis for numerous components in cements, clays, iron and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis, quantitative determination of sediments in milk and as a pure analytical grade clean-up filter for solutions prior to AA spectro- photometry. Used also as a high purity filter in the collection of trace elements and radionuclides from the atmosphere.

Grade 41: 20-25µm
The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminium hydroxides). Also used in quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates. This filter is also available in the Whatman Disposable Filter Funnel. This is a convenient, disposable 47mm filter funnel with a 250mL capacity. The 47mm Grade 41 filter can be easily removed for further analysis or culturing.

Grade 42: 2.5µm
A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers. Typical analytical precipitates include barium sulphate, metastannic acid and finely precipitated calcium carbonate.

Grade 43: 16µm
Intermediate in retention between Grade 40 and 41, and twice as fast as Grade 40. Typical applications include foodstuffs analysis; soil analysis; particle collection in air pollution monitoring for subsequent ana