Whatman* Grade 50 Quantitative Filter Paper Hardened Low Ash, sheet, white smear tab - Each

Grade 50 sheets, white smear tab, hardened low ash. Smear Tab format for wipe testing (e.g., testing of surfaces for radionuclide contamination).

Hardened low ash: 0.015% ash maximum. These filters are treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These are particularly suitable for Bchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.
The maximum ash content of these grades is intermediate between ashless and qualitative grades. They are particularly suitable for Bchner 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 those of the acid-hardened ashless filter papers.

Grade 50: 2.7 µm
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 Bchner or three-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.
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Surface Wipes - Smear Tab, Grade 50