WHA1442240

Whatman^® quantitative filter paper, ashless, Grade 42

circles, diam. 240 mm, pack of 100

• Synonym(s): Whatman paper, Z241156, filter papers, paper filter
• UNSPSC Code: 41104900
• NACRES: NB.24

Properties

• material: circles ; cotton filters (high-quality cotton linters)
• packaging: pack of 100
• manufacturer/tradename: Whatman 1442-240; Whatman Article No. 28418048 (US reference)
• parameter: 0.40 psi wet burst; 1870 sec/100 mL speed (Herzberg)
• diam.: 240 mm
• thickness: 200 μm
• ash: ≤0.007%
• pore size: 2.5 μm (Particle retention)
• basis weight: 100 g/m²

Description

General description

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 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.

Application

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

Features and Benefits

• 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

Other Notes

Field of Use : For internal research use only. Products are not intended for diagnostic use or resale.

Legal Information

Whatman is a registered trademark of Cytiva