Skip to Content
Merck
All Photos(2)

Key Documents

WHA1450240

Whatman® quantitative filter paper, hardened low-ash, Grade 50

circles, diam. 240 mm, pack of 100

Synonym(s):

Whatman filter, Z241806, filter paper, 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 1450-240
Whatman Article No. 28418087 (US reference)

parameter

2685 sec/100 mL speed (Herzberg)
6 psi wet burst

diam.

240 mm

thickness

0.12115 μm

ash

≤0.015%

pore size

2.7 μm (Particle retention)

basis weight

97 g/m2

Looking for similar products? Visit Product Comparison Guide

General description

The maximum ash content of these filter paper grades is intermediate between ashless and qualitative grades. They are particularly suitable for Büchner filtrations where it is desirable to recover the precipitate from the filter surface after filtration. Other characteristics include high wet strength and chemical resistance which are similar to the acid hardened ashless filter papers.

Grade 50: 2.7 μm (slow filter paper)
Retention of very fine crystalline precipitates. The thinnest of all Whatman filter papers. Slow flow rate. Hardened and highly glazed surface. This finish also keeps the paper free from loose surface fibers. Highly suitable for qualitative or quantitative filtrations requiring vacuum assistance on Büchner or 3-piece filter funnels. Very strong when wet. Will withstand wet handling and precipitate removal by scraping. In the electronics industry, the virtual absence of fiber shedding is utilized in carriers for integrated circuits.

Features and Benefits

  • Thinner filter design (average thickness 115 µm) than most Büchner filter papers
  • Nominal particle retention of 2.7 µm
  • Slow flow rates (Herzberg filtration speed 2685 s)
  • High purity and low ash content (0.015% ash maximum)
  • Acid-treated for high wet-strength and chemical resistance
  • Hardened to minimize fiber shredding

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