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Whatman filter paper No 41 ashless - flat discs

grade 41:20-25 a


Whatman quantitative filters are designed for gravimetric analyzes and for the preparation of samples for instrumental analyzes.

They are available in three versions to meet all specific needs:

  • Ash-free (max content 0.007%)

degree 40-41-42-43-44-589 / 1-589 / 2-589 / 3

  • Hardened with low ash content (max 0.015%)

Grade 50-52-54

  • Hardened without ash (max 0.006%)

Grade 540-541-542

 

Grade 41: 20-25 µm

The fastest ashless filter paper recommended for analytical procedures involving the presence of coarse particles or gelatinous precipitates (eg iron or aluminum hydroxides).

Also used in the quantitative analysis of atmospheric pollutants as a paper tape to be impregnated for the determination of gaseous compounds at high flow rates.

This filter is also available in the Whatman Disposable Filter Funnel - a handy 47mm diameter disposable filter funnel with a capacity of 250ml. The filter can be easily extracted for further analysis or culture.

 

Technical features

Nominal retention of particles in liquids (at 98% efficiency)

20-25 µm

Nominal thickness

215 µm

Typical water flow

254 ml / min

Nominal base weight

85 g / m²

Nominal air flow

4 s / 100 ml / in (for 9 cm diameter)

Nominal ash content

(determined by incinerating the filter at 900 ° C in the air)

0.07%

Material

High quality cotton linters

Typical levels of trace elements

Aluminum 2,5 µg / g Antimony <0,5 µg / g Arsenic <0,5 µg / g Barium <0,5 µg / g Boron

Format

Discs

Pieces per pack

100 pieces

 

Code Description
481441042 Whatman filter paper n.41 ashless - flat discs diam. 42.5 mm
481441047 Whatman filter paper n.41 ashless - flat discs diam. mm 47
481441055 Whatman filter paper n.41 ashless - flat discs diam. 55 mm
481441070 Whatman filter paper n.41 ashless - flat discs diam. 70 mm
481441090 Whatman filter paper n.41 ashless - flat discs diam. 90 mm
481441110 Whatman filter paper n.41 ashless - flat discs diam. 110 mm
481441125 Whatman filter paper n.41 ashless - flat discs diam. 125 mm
481441150 Whatman filter paper n.41 ashless - flat discs diam. 150 mm
481441185 Whatman filter paper n.41 ashless - flat discs diam. 185 mm
481441240 Whatman filter paper n.41 ashless - flat discs diam. 240 mm
481441320 Whatman filter paper n.41 ashless - flat discs diam. 320 mm

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