Skip to Content
Merck
All Photos(2)

Key Documents

WHA1444150

Whatman® quantitative filter paper, ashless, Grade 44

circles, diam. 150 mm, pack of 100

Synonym(s):

Whatman filter, Whatman paper, Z241202, paper filter

Sign Into View Organizational & Contract Pricing
All Photos(2)

About This Item

UNSPSC Code:
41104900
NACRES:
NB.24

material

circles
cotton filters (high-quality cotton linters)

packaging

pack of 100

manufacturer/tradename

Whatman 1444-150
Whatman Article No. 28418067 (US reference)

parameter

0.29 psi wet burst
995 sec/100 mL speed (Herzberg)

diam.

150 mm

thickness

180 μm

ash

≤0.007%

pore size

3 μm (Particle retention)

basis weight

80 g/m2

Looking for similar products? Visit Product Comparison Guide

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 44: 3 μm (slow to medium filter paper)
Thin version of Grade 42 retaining very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42.

Features and Benefits

  • Accurate ash free dry mass measurements
  • Fine nominal particle retention rating of 3 µm
  • filtration speed (Herzberg 995 s)
  • Typical thickness of 180 µm

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

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service