Filter Papers
Quantitative filter papers - Hardened low ash grades
Filter Papers
Quantitative filter papers - Hardened low ash grades
The maximum ash content of these 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.
Whatman™ quantitative filters are designed for gravimetric analysis and the preparation of samples for instrument analysis. They are available in three formats designed for specific requirements.
0.015% ash nominal—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.
Product Info
Applications
Grade 50 (2.7 μm*)
Retention of very fine crystalline precipitates. The thinnest of all WhatmanTM filter papers with a slow flow rate, these filters have a hardened and highly glazed surface, which 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 and 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.
This grade is also available in Smear Tab format for wipe testing (e.g. testing of surfaces for radionuclide
contamination).
Grade 52 (7 μm*)
The general purpose hardened filter paper with medium retention and flow rate. Very hard surface.
Grade 54 (22 μm*)
Very fast filtration and high wet strength makes this grade very suitable for vacuum assisted fast filtration of difficult
coarse or gelatinous precipitates.
* Particle retention rating at 98% efficiency
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Whatman™ Price List 2021
| Cat. Nos | Description | MRP INR | |||
|---|---|---|---|---|---|
| 1450-042 | GR 50 4.25CM 100/PK | 2440 | |||
| 1450-055 | GR 50 5.5CM 100/PK | 2300 | |||
| 1450-070 | GR 50 7CM 100/PK | 2650 | |||
| 1450-090 | GR 50 9CM 100/PK | 3320 | |||
| 1450-110 | GR 50 11CM 100/PK | 5010 | |||
| 1450-125 | GR 50 12.5CM 100/PK | 5310 | |||
| 1450-150 | GR 50 15CM 100/PK | 7720 | |||
| 1450-185 | GR 50 18.5CM 100/PK | 11420 | |||
| 1450-240 | GR 50 24CM 100/PK | 19480 | |||
| 1450-294 | GR 50 294MM 500/PK | 81480 | |||
| 1450-320 | GR 50 32CM 100/PK | 30130 | |||
| 1450-916 | GR 50 15x23CM 100/PK | 20510 | |||