Whatman 1004-070 Quantitative Filter Paper Circles, 20-25 Micron, 3.7 s/100mL/sq inch Flow Rate, Grade 4, 70mm Diameter (Pack of 100)

These work really well for fine filtration, use for cold brew coffee.BTW, anyone talking about buying low ash filters for more money generally has no idea what they're talking about. Low ash filters are used when analyzing the filtrate captured will require burning the sample to determine what you've captured. Low ash doesn't mean there's any less ash in the filter to "contaminate" or otherwise effect the solution drawn through the filter, it means the fibers used to make it produce essentially zero ash at the time of combustion, so they won't effect the analysis of the filtrate. There's no ash in any of them before you burn them away as part of a chemical analysis. Anyone using low ash filters to produce a solution, rather than for combustion analysis of the trapped solids, doesn't understand what the different filters are for.

New user of a buchner funnel, but the filter papers seem too rigid to seal at the edges. I'll try to add a picture, but the filter paper will not lay perfectly flat in the funnel, and does not soften sufficiently to hug the outer edge.

Ok

worked great

Works as advertised

Works Well with Buchner Filter

Did nt f8t ky use, e-waste recycling...

Perfect for a fine filtering wash when making oils