Whatman Filter Paper - Grade 50 Circles
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.
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 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.
This grade is also available in Smear Tab format for wipe testing (e.g., testing of surfaces for radionuclide contamination).


Available In The Following Sizes
Diameter P/Box
55 mm 100
70 mm 100
90 mm 100
110 mm 100
125 mm 100
150 mm 100
185 mm 100
240 mm 100
320 mm 100


Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on our website.