100 Pcs Qualitative Filter Papers Medium Speed Flow Filter Papers 90mm Laboratory Filter Papers for Filter Experiment, Oil Test

Works well for what I need them for. As advertised.

small sized and actually the wrong product for me - but a good product - it was my fault not orderering properly

The media could not be loaded. Great value for small projects. Easy to use doesn’t tend to rip folds easily, it is a high quality product would work well in a small lab or at home(or even for experimenting with coffee taste ) would recommend

Good stuff

These have a very slow flow rate, in fact water hardly passes through without a significant pressure head. Not really suitable for average filtration use.

Kept child scientists happy for ages exploring separation!

I certainly had a challenge ready for these filter papers. The "mess" that is in my images there is some wire wool dissolving in vinegar, to make a dye for oak. I hadn't got up courage to filter it until incentivised to do so when I got the chance to try these papers.The papers are on the small side for a normal funnel, so they are definitely more suited to a Buchner funnel (available in this size 90mm which I own but not the flask) and vacuum flask set up .But we do what we can, the papers are very fine, I ended up pre filtering the liquid through a course filter to get the large items out. I then tried one of these filters and it became blocked very quickly. I then decided to run the liquid again through some intermediate papers I already owned to do some of the heavy lifting, then finished with one last pass through using these filters.That the filters became blocked isnt a fault of the filters, as I stated before they are super fine, and given some vacuum assist they would have been fairly rapid. You use the right filters for the job.I did finally manage to get a vacuum set up under a Buchner funnel and gave it one pass (all I think my jury rigged set up would take) and the end result can be seen. The result was very good indeed, very satisfying given the dire start material it had to work with, these filters really did do well given the unprofessional set ups.Materially they are nice and thick, pretty substantial but that's often the case given their intended use.The item description correctly identities these as qualitative filter papers rather than quantitative or ash free, the image attached shows the residue from burning one paper, again, it is what it is for the job intended.

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