■
Features
* Quantitative Filter Papers
Hardened Low Ash Grades (Ash 0.015%)
The maximum ash content of these grades is intermediate
between ashless and qualitative grades. They are particularly suitable for
Buchner 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: 2.7µm
Retention of finest 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
fibres. 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 fibre
shedding is utilised in carriers for integrated circuits.
Grade 52: 7µm
The general purpose hardened filter paper with medium
retention and flow rate. Very hard surface.
Grade 54: 20-25µm
Very fast filtration for use with coarse and gelatinous
precipitates. High wet strength makes this grade very suitable for vacuum
assisted fast filtration of “difficult” coarse or gelatinous
precipitates. |