Our high-purity Whatman ashless Grade 42 quantitative filter papers are suitable for a wide range of critical analytical filtration procedures for quantitative analysis. Grade 42 filter papers have the finest retention of all Whatman ashless filter paper grades. Grade 42 is designed for gravimetric analysis and sample preparation for instrumental analysis.
Whatman ashless quantitative filter papers are high-purity filters that 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 ashless filter papers are suited for:
Grade 42 Ashless Filter Paper for Instrumental Analysis, 125 mm circle (100 pcs)
Typical Particle Retention in Liquid1
Typical water flow rate2
Nominal Basis Weight
Nominal Air Flow Rate
96 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
Designed for gravimetric analysis and the preparation of samples for instrumental analysis. For critical gravimetric analysis with the finest particle retention.
Ø 125 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.