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Grade 40 Ashless Filter Paper 150 mm

Whatman Grade 40 high-purity filters are general-purpose papers for quantitative analysis. Grade 40 filters are suitable for a variety of analytical filtration applications.
Manufacturer: Whatman
Product Code: 1440-150
GST: 18.00 %
Catalog Number: 1440-150
HSN Code: 48232000
Packaging: 100 Circles
UOM: Pack
Delivery date: 3-5 days
₹ 6,780.00

These filter papers are designed for gravimetric analysis and the preparation of samples for instrumental analysis. 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.

  • High-purity filters contain 0.007% maximum ash content
  • Medium nominal particle retention rating of 8 µm
  • Medium filtration speed (Herzberg 340 s)
  • Particularly useful for gravimetric analysis

Applications for high-purity Grade 40 filters

High-purity filters support accurate analysis in applications sensitive to very low levels of background contamination and in gravimetric analysis where ash content might affect weight measurements of combusted samples. Whatman Grade 40 ashless paper is suited to:

  • Soil analysis, when separating solid matter from aqueous extracts
  • Quantitative determination of milk sediment
  • Use as a clean-up filter for solutions prior to atomic absorption (AA) spectrometry
  • Analysis of constituent components in cements, clays, iron, and steel products
  • Collection of trace elements and radionuclides from the atmosphere.



Grade 40 Ashless Filter Paper for Pollution Analysis, 150 mm circle (100 pcs)


Grade 40





Typical Particle Retention in Liquid1

8 µm

Nominal Thickness

210 µm

Typical water flow rate2

25 ml/min

Nominal Basis Weight

95 g/m²

Nominal Air Flow Rate

21 s/100 mL/in²

Nominal Ash Content3



High-quality cotton linters

Alpha Cellulose Content Min.


Typical Trace Element Levels

Aluminium 2.5 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead <0.5 µg/g Magnesium 4 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 2.3 µg/g Silicon 6.2 µg/g Sodium 16.8 µg/g Zinc 64.5 µg/g


Ø 150 mm


1Particle retention rating at 98% efficiency.

2For 9 cm diameter

3Ash is determined by ignition of the cellulose filter at 900°C in air.

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