Very poor paper, warped (see image), does not seal with Buchner funnels, does not tolerate cold substrates, very inflexible for a quantitative article that needs to be flexible, manipulable, but not particularly rigid. Look for "Lab Nerd" filters for high quality "quantitative" and "fast" compaction on Buchner funnels. I think Scientific of Houston is a good supplier, I just think that "Double Rings" company sells terrible products. You don't have to spend money on products that don't match their description.
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