Quantitative Filter Paper, Hardened Low Ash

Photo of Whatman Grade 54 Quantitative Filter Paper

Whatman No. 54. Quantitative, hardened, low ash. Very fast filtration and 20-25 µm. retention. For use with coarse and gelatinous precipitates. High wet-strength. 100 circles/box.

Photo of Whatman Grade 50 Quantitive Filter Paper

Whatman No. 50. Quantitative, hardened, low ash. Retention of finest crystalline precipitates (2.7 µm). 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.

Photo of Whatman Grade 52 Hardened Low Ash Quantitative Filter Paper

Whatman No. 52. Quantitative, hardened, low ash. General purpose hardened paper with 7µm particle retention and medium flow rate. Ideal for Büchner funnel work. 100 circles/box.