This is a strong filter paper with a medium flow rate and retention. Grade 322 is commonly used in student laboratories. This strong general-purpose filter is also useful in Buchner funnels for barium carbonate, lead chromate and beryllium hydroxides.

Whatman Cross Reference = No.93 Speed class Fast Filtering Thickness (mm) 0.15 Pore size (μM) 10-20 Weight (g/m²) 150 Filtration Speed (sec*) 50 Burst Strength (Kg/cm²) 1.45

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