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首页 >>> 产品目录 >>> 代理品牌 >>> Whatman系列 >>> 纤维滤纸 Cellulose Filter >>> Quantitative Filter Papers - Ashless Grades (Ash 0.007%) 无灰分滤纸

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 for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades – very pure filters suitable 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 extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.

Grade 40: 8 µm
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 spectrometry. Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.

Grade 41: 20 µm
The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum 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 disposable filter funnel. This is a convenient, disposable 47 mm filter funnel with a 250 ml capacity. The 47 mm Grade 41 filter can be easily removed for further analysis or culturing.

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

Grade 43: 16 µm 
Intermediate in retention between Grades 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 analysis by XRF techniques; and inorganic analysis in the construction, mining and steel industries.

Grade 44: 3 µm 
Thin version of Grade 42 retaining very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42.

Grade 589/1: 12-25 µm
‘Black Ribbon Filter’ – the established standard in quantitative analysis for the filtration of coarse precipitates (class 2a acc. to DIN 53 135). Ashless filter paper with very high flow rate. Used for many quantitative standard methods, especially for gravimetric applications (e.g., determination of the ash content in foodstuffs), or for the Blaine test in the cement industry. Also available prepleated as Grade 589/1 1/2.

Grade 589/2: 4-12 µm
‘White Ribbon Filter’ – ashless standard filter paper for medium fine precipitates (class 2b acc. to DIN 53 135) offering medium filtration speed. Applied in a variety of routine methods in quantitative analysis, e.g., determination of the sand content in foodstuffs; determination of the grade of flour; or analysis of aqueous suspensions in the paper industry. Also available prepleated as Grade 589/2 1/2.

Grade 589/3: 2 µm
‘Blue Ribbon Filter’ – ashless standard filter paper for very fine precipitates (class 2d acc. to DIN 53 135). Slow filter paper with highest efficiency for collecting very small particles. Also used for many analytical routine methods in different industries, e.g., determination of the amount of insoluble contaminants in animal and vegetable fats and oils. Also available prepleated as Grade 589/3 1/2.

 

Typical Properties - Ashless Quantitative Papers
Grade Description Particle
retention
in liquid (µm)
Filtration speed
herzberg (s)
Ash content* (%) Typical
thickness
(µm)
Basis weight
(g/m2)
40 Medium flow 8 340 0.007 210 95
41 Fast 20 54 0.007 220 85
42 Slow 2.5 1870 0.007 200 100
43 Medium to fast 16 155 0.007 220 95
44 Slow to medium 3 995 0.007 180 80
589/1 Fast 12-25 25 0.01 190 80
589/2 Medium fast 4-12 70 0.01 180 85
589/3 Slow < 2 375 0.01 160 84
* Ash is determined by ignition of the cellulose filter at 900°C in air
 Particle retention rating at 98% efficiency
 Approximate values

 


Ordering Information - Quantitative Filter Papers - Ashless Grades (Ash 0.007%)
Catalog Number Description

Grade 40

1440-012 Grade 40 circles, 12.7 mm, 400/pk
1440-329 Grade 40 circles, 30 mm, 100/pk
1440-032 Grade 40 circles, 32 mm, 100/pk
1440-042 Grade 40 circles, 42.5 mm, 100/pk
1440-047 Grade 40 circles, 47 mm, 100/pk
1440-055 Grade 40 circles, 55 mm, 100/pk
1440-070 Grade 40 circles, 70 mm, 100/pk
1440-090 Grade 40 circles, 90 mm, 100/pk
1440-110 Grade 40 circles, 110 mm, 100/pk
1440-125 Grade 40 circles, 125 mm, 100/pk
1440-150 Grade 40 circles, 150 mm, 100/pk
1440-185 Grade 40 circles, 185 mm, 100/pk
1440-240 Grade 40 circles, 240 mm, 100/pk
1440-320 Grade 40 circles, 320 mm, 100/pk
1440-6168 Grade 40 circles, 450 mm, 100/pk
1440-917 Grade 40 sheets, 460 x 570 mm, 100/pk

Grade 41

1441-325 Grade 41 circles, 25 mm, 100/pk
1441-025 Grade 41 circles, 25 mm, 400/pk
1441-6309 Grade 41 circles, 25 mm, 10 000/pk
1441-040 Grade 41 circles, 40.5 mm, 100/pk
1441-042 Grade 41 circles, 42.5 mm, 100/pk
1441-047 Grade 41 circles, 47 mm, 100/pk
1441-050 Grade 41 circles, 50 mm, 100/pk
1441-055 Grade 41 circles, 55 mm, 100/pk
1441-060 Grade 41 circles, 60 mm, 100/pk
1441-070 Grade 41 circles, 70 mm, 100/pk
1441-090 Grade 41 circles, 90 mm, 100/pk
1441-105 Grade 41 circles, 105 mm, 100/pk
1441-110 Grade 41 circles, 110 mm, 100/pk
1441-125 Grade 41 circles, 125 mm, 100/pk
1441-150 Grade 41 circles, 150 mm, 100/pk
1441-185 Grade 41 circles, 185 mm, 100/pk
1441-240 Grade 41 circles, 240 mm, 100/pk
1441-320 Grade 41 circles, 320 mm, 100/pk
1441-866 Grade 41 sheets, 203 x 254 mm, 100/pk
1441-917 Grade 41 sheets, 460 x 570 mm, 100/pk
1920-1441 Disposable filter funnel 250 ml, 47 mm, 5/pk

Grade 42

1442-042 Grade 42 circles, 42.5 mm, 100/pk
1442-047 Grade 42 circles, 47 mm, 100/pk
1442-055 Grade 42 circles, 55 mm, 100/pk
1442-070 Grade 42 circles, 70 mm, 100/pk
1442-090 Grade 42 circles, 90 mm, 100/pk
1442-110 Grade 42 circles, 110 mm, 100/pk
1442-125 Grade 42 circles, 125 mm, 100/pk
1442-150 Grade 42 circles, 150 mm, 100/pk
1442-185 Grade 42 circles, 185 mm, 100/pk
1442-240 Grade 42 circles, 240 mm, 100/pk
1442-320 Grade 42 circles, 320 mm, 100/pk
1442-6551 Grade 42 sheets, 25.4 x 90 mm, 100/pk
1442-917 Grade 42 sheets, 460 x 570 mm, 100/pk
1442-930 Grade 42 sheets, 580 x 580 mm, 500/pk

Grade 43

1443-090 Grade 43 circles, 90 mm, 100/pk
1443-110 Grade 43 circles, 110 mm, 100/pk
1443-125 Grade 43 circles, 125 mm, 100/pk
1443-150 Grade 43 circles, 150 mm, 100/pk
1443-185 Grade 43 circles, 185 mm, 100/pk

Grade 44

1444-070 Grade 44 circles, 70 mm, 100/pk
1444-090 Grade 44 circles, 90 mm, 100/pk
1444-110 Grade 44 circles, 110 mm, 100/pk
1444-125 Grade 44 circles, 125 mm, 100/pk
1444-150 Grade 44 circles, 150 mm, 100/pk
1444-185 Grade 44 circles, 185 mm, 100/pk
1444-240 Grade 44 circles, 240 mm, 100/pk
1444-917 Grade 44 sheets, 460 x 570 mm, 100/pk

Grade 589/1

10300009 Grade 589/1 circles, 90 mm, 100/pk
10300010 Grade 589/1 circles, 110 mm, 100/pk
10300011 Grade 589/1 circles, 125 mm, 100/pk
10300012 Grade 589/1 circles, 150 mm, 100/pk
10300014 Grade 589/1 circles, 185 mm, 100/pk

Grade 589/1 ½

10300045 Grade 589/1 1/2 folded filter, 150 mm, 100/pk

Grade 589/2

10300102 Grade 589/2 circles, 12.7 mm, 1000/pk
10300103 Grade 589/2 circles, 40.5 mm, 100/pk
10300106 Grade 589/2 circles, 50 mm, 100/pk
10300107 Grade 589/2 circles, 55 mm, 100/pk
10300108 Grade 589/2 circles, 70 mm, 100/pk
10300109 Grade 589/2 circles, 90 mm, 100/pk
10300110 Grade 589/2 circles, 110 mm, 100/pk
10300111 Grade 589/2 circles, 125 mm, 100/pk
10300112 Grade 589/2 circles, 150 mm, 100/pk
10300114 Grade 589/2 circles, 185 mm, 100/pk
10300120 Grade 589/2 circles, 240 mm, 100/pk

Grade 589/2 ½

10300143 Grade 589/2 1/2 folded filters, 110 mm, 100/pk
10300145 Grade 589/2 1/2 folded filters, 150 mm, 100/pk

Grade 589/3

10300263 Grade 589/3 circles, 12.7 mm, 1000/pk
10300210 Grade 589/3 circles, 110 mm, 100/pk
10300211 Grade 589/3 circles, 125 mm, 100/pk
10300212 Grade 589/3 circles, 150 mm, 100/pk
10300214 Grade 589/3 circles, 185 mm, 100/pk

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