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WHA1004042

Whatman® qualitative filter paper, Grade 4

circles, diam. 42.5 mm, pack of 100

Synonym(s):

Whatman filter, Whatman filters, Whatman paper, Z240516, filter paper, filter papers, paper filter

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About This Item

UNSPSC Code:
41104900
NACRES:
NB.24

material

cellulose filters
circles

packaging

pack of 100

manufacturer/tradename

Whatman 1004-042
Whatman Article No. 28414007 (US reference)

parameter

0.22 psi wet burst
37 sec/100 mL speed (Herzberg)

diam.

42.5 mm

thickness

205 μm

ash

≤0.06%

pore size

20-25 μm (Particle retention)

basis weight

92 g/m2

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General description

Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper.

Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis

Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are available in a variety of sizes and formats including circles, sheets, and rolls. They are also available as prepleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Features and Benefits

  • Useful in qualitative analytical separations when Fast flow is required and the collection of fine particles is not critical.
  • These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).

Other Notes

Field of Use : For internal research use only. Products are not intended for diagnostic use or resale.

Legal Information

Whatman is a registered trademark of Cytiva

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Elizabeth Evans et al.
The Analyst, 139(21), 5560-5567 (2014-09-11)
This paper describes a silica nanoparticle-modified microfluidic paper-based analytical device (μPAD) with improved color intensity and uniformity for three different enzymatic reactions with clinical relevance (lactate, glucose, and glutamate). The μPADs were produced on a Whatman grade 1 filter paper
Elizabeth Evans et al.
The Analyst, 139(9), 2127-2132 (2014-03-13)
A systematic investigation was conducted to study the effect of paper type on the analytical performance of a series of microfluidic paper-based analytical devices (μPADs) fabricated using a CO2 laser engraver. Samples included three different grades of Whatman chromatography paper

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