No. 42 Filter Circles 5.5cm/100

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.

Ashless: 0.007% ash maximum

Fine (2.5 μm) nominal particle retention rating, eliminates large particles that might otherwise interfere with sensitive instrumentation

Herzberg filtration speed of 1870 s

Commonly used as a calcium carbonate filter

Particularly suitable for gravimetric analysis

Whatman Grade 42 quantitative papers from Cytiva business are designed for retention of extremely small particles. A common example is use of Grade 42 as a calcium carbonate filter for analysis in the cement industry.