Whatman Grade 40 Quantitative Ashless Filter Paper, Medium Fine Precipitates Retained, 12.5 cm Diameter, 100/PK, Cytiva, 1440-125

Cytiva® Whatman® Grade 40 Quantitative Ashless Filter Paper, Medium Fine Precipitates Retained, 12.5 cm Diameter, 1440-125

• High-purity, general-purpose papers for quantitative analysis
• Grade 40 filters are suitable for variety of analytical filtration applications
• 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
• Cytiva offers wide range of Whatman ashless and hardened ashless filter papers for gravimetric analysis
• 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
• Nominal thickness: 210 µm
• Nominal basis weight: 95 g/m²
• Alpha minimum cellulose content: ≥98%
• Trace element contents: 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 

Applications:

• Soil analysis, when separating solid matter from aqueous extracts
• Quantitative determination of milk sediment
• Use as 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 atmosphere