Grade 40 Ashless Filter Paper for Pollution Analysis, Circle & Sheet

Description

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

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 gravimetric analysis where ash content might affect weight measurements of combusted samples. GE’s high-purity 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

Parameter	Grade 40 Ashless Filter Paper for Pollution Analysis, Circle & Sheet
Grade :	Grade 40
Grade Type :	Ashless
Typical Particle Retention in Liquid¹ :	8 µm
Nominal Thickness :	210 µm
Typical water flow rate² :	25 ml/min
Nominal Basis Weight. :	95g/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 µg/g Antimony less than 0.5 µg/g Arsenic less than 0.5 µg/g Barium less than 0.5 µg/g Boron less than 1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead less than 0.5 µg/g Magnesium 4 µg/g Manganese less than 0.5 µg/g Mercury less than 0.5 µg/g Potassium 2.3 µg/g Silicon 6.2 µg/g Sodium 16.8 µg/g Zinc 64.5 µg/g
Application :	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.
Dimensions:	Circle – Ø12.7 mm, Ø30 mm, Ø32 mm, Ø42.5 mm, Ø47 mm, Ø55 mm, Ø70 mm, Ø90 mm, Ø110 mm, Ø125 mm, ØØ150 mm, Ø185 mm, Ø240 mm, Ø320 mm, Ø450 mm, Sheet – 460 x 570 mm
Pack Size :	100 pieces