Whatman quantitative filter paper, ashless, Grade 42 circles, diam. 90 mm, pack of 100

SKU:
WHA1442090
  • $50.50
  • Description

    Whatman® quantitative filter paper, ashless, Grade 42

    circles, diam. 90 mm, pack of 100

    Synonym(s):
    Whatman paper, Z241091, filter papers, paper filter
    NACRES:
    NB.24

    PROPERTIES

    material

    circles
    cotton filters (high-quality cotton linters)

    packaging

    pack of 100

    manufacturer/tradename

    Whatman 1442-090
    Whatman Article No. 28418042 (US reference)

    parameter

    0.40 psi wet burst
    1870 sec/100 mL speed (Herzberg)

    diam.

    90 mm

    thickness

    200 μm

    ash

    ≤0.007%

    pore size

    2.5 μm (Particle retention)

    basis weight

    100 g/m2

    General description

    Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.

    Ashless
    : 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades - very pure filters suitable for a wide range of critical analytical filtration procedures.

    Hardened low ash
    : 0.015% ash maximum - treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.

    Hardened ashless:
     0.006% ash maximum - acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.

    Grade 42: 2.5 μm (slow filter paper)

    A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers. Typical analytical precipitates include barium sulfate, metastannic acid, and finely precipitated calcium carbonate.

    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