No 42 Filter Circles 24cm/100

Other typical precipitates for gravimetric analysis include barium sulfate and metastannic acid for use in glazes, coatings, and pigments. The high purity of Cytiva's Grade 42 filters also makes them suitable for processes that require ashing.

Ashless filter papers for gravimetric and instrumental analysis

Cytiva offers a range of Whatman ashless filter papers for your gravimetric analysis needs. See our other Whatman ashless grades to find the right filter paper for your sample, or use our hardened Whatman ashless filter paper grades if your analysis involves strong acid or alkali suspensions.

What are Whatman ashless quantitative filter papers

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. Cytiva's high-purity Whatman ashless filter papers are suited for:

• Environmental analysis: soil filtration analysis, when separating solid matter from aqueous extracts
• Retention of small particles
• Collection of trace elements and radionuclides from the atmosphere