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Whatman filter paper No 40 ashless - flat discs

grade 40:8 one


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%) -grade 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 40: 8 µm

The classic ashless general purpose filter paper with medium speed and retention capacity.

Typical applications include gravimetric analysis for numerous compounds in cements, clays, iron and steel products; as a primary filter for the separation of solid materials from aqueous extracts in general soil analysis, for the quantitative determination of sediments in milk and as a simple analytical grade filter for the purification of solutions prior to AA spectrophotometry.

It is also used as a high purity filter for the collection of trace elements and radionuclides from the atmosphere.

 

Technical features

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

8 µm

Nominal thickness

210 µm

Typical water flow

25 ml / min

Nominal base weight

95 g / m²

Nominal air flow

21 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

Format

Discs

Pieces per pack

100 pieces
Code Description
481440042 Whatman filter paper n.40 ashless - flat discs diam. 42.5 mm
481440047 Whatman filter paper n.40 ashless - flat discs diam. mm 47
481440055 Whatman filter paper n.40 ashless - flat discs diam. 55 mm
481440070 Whatman filter paper n.40 ashless - flat discs diam. 70 mm
481440090 Whatman filter paper n.40 ashless - flat discs diam. 90 mm
481440110 Whatman filter paper n.40 ashless - flat discs diam. 110 mm
481440125 Whatman filter paper n.40 ashless - flat discs diam. 125 mm
481440150 Whatman filter paper n.40 ashless - flat discs diam. 150 mm
481440185 Whatman filter paper n.40 ashless - flat discs diam. 185 mm
481440240 Whatman filter paper n.40 ashless - flat discs diam. 240 mm
481440329 Whatman filter paper n.40 ashless - flat discs diam. 30 mm

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