|Home||» Products||» Filter Papers||» Filter paper Grade: 40, 12.7 mm|
Whatman Grade 40 high-purity filters from GE Healthcares Life Sciences business are general-purpose papers for quantitative analysis. Grade 40 filters are suitable for a variety of analytical filtration applications.
High-purity filters contain 0.007% maximum ash content
GE offers a range of Whatman ashless filter paper for your gravimetric analysis needs. See our other ashless grades to find the right filter for your sample, or use our hardened ashless grades if your analysis involves strong acid/alkali suspensions.
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 a gravimetric analysis where ash content might affect weight measurements of combusted samples. GEs high-purity Whatman Grade 40 ashless paper is suited to:
Looking for a filter paper, membrane filter, or syringe filter? Let GE help you find the optimal filter for your needs to ensure reliable analysis.
|Parameter||Grade 40 Ashless Filter Paper for Pollution Analysis, 12.7 mm circle (400 pcs)|
|Typical Particle Retention in Liquid1||8 micro-m|
|Nominal Thickness||210 micro-m|
|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||0.007%|
|Material||High-quality cotton linters|
|Alpha Cellulose Content Min.||98%|
|Typical Trace Element Levels||Aluminium 2.5 micro-g/g Antimony <0.5 micro-g/g Arsenic <0.5 micro-g/g Barium <0.5 micro-g/g Boron <1 micro-g/g
Calcium 8.3 micro-g/g Chromium 1.5 micro-g/g Copper 2 micro-g/g Iron 12 micro-g/g
Lead <0.5 micro-g/g Magnesium 4 micro-g/g Manganese <0.5 micro-g/g
Mercury <0.5 micro-g/g Potassium 2.3 micro-g/g Silicon 6.2 micro-g/g Sodium 16.8 micro-g/g Zinc 64.5 micro-g/g
|Application||Designed for gravimetric analysis and the preparation of samples for instrumental analysis.
Gravimetric analysis for numerous components
in cement, 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.