Details

Whatman Quantitative Filter Papers, Ashless, Grade 42

With the finest retention of all Whatman ashless filter paper grades, Grade 42 is designed for gravimetric analysis and sample preparation for instrumental analysis.

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 Âµm) 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. 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 ourÂ other Whatman ashless gradesÂ to find the right filter paper for your sample, or use ourÂ hardened Whatman ashless filter paper gradesÂ 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

Parameter	Grade 42 Ashless Filter Paper for Instrumental Analysis, 42.5 mm circle (100 pcs)
Grade	Grade 42
Format	Circles
Type	Ashless
Typical Particle Retention in Liquid¹	2.5 Âµm
Nominal thickness	200Â Âµm
Typical water flow rate²	5 ml/min
Nominal basis weight	100Â g/mÂ²
Nominal air flow rate	96 s/100 mL/inÂ²
Nominal Ash Content³	0.007%
Material	High-quality cotton linters
Alpha Cellulose Content Min.	=98%
Typical Trace Element Levels	Aluminium 2.5 Âµg/g Antimony <0.5 Âµg/g Arsenic <0.5 Âµg/g Barium <0.5 Âµg/g Boron <1 Âµg/g Calcium 8.3 Âµg/g Chromium 1.5 Âµg/g Copper 2 Âµg/g Iron 12 Âµg/g Lead <0.5 Âµg/g Magnesium 4 Âµg/g Manganese <0.5 Âµg/g Mercury <0.5 Âµg/g Potassium 2.3 Âµg/g Silicon 6.2 Âµg/g Sodium 16.8 Âµg/g Zinc 64.5 Âµg/g
Application	Designed for gravimetric analysis and the preparation of samples for instrumental analysis. For critical gravimetric analysis with the finest particle retention.
Dimensions	Ã˜ 42.5 mm