There's the old saying, "is water wet?". It's rhetorical, but actually water isn'twet. Not as wet as many other things, anyway.
This presents a problem: although the molecules are small, surface tension is high.
It feels like you might be looking for Gore-Tex except (a) it's only permeable to water vapour, not to liquid water and (b) the ePTFE is weak unless bonded to something else, and the something else would have to withstand boiling water.
Maybe you want filter paper. Though it's important to note you do want things bigger than water molecules to get through, otherwise you're left without any flavour, which kinda misses the point.
What you really want is filter paper which is permeable to all the flavour elements of tea but not any grot. I believe such purpose-made filters are widely available, with the added convenience that a each filter pre-encapsulates a measured amount of tea. :-p
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timeasmymeasure
no subject
Date: 2016-03-27 12:20 am (UTC)This presents a problem: although the molecules are small, surface tension is high.
It feels like you might be looking for Gore-Tex except (a) it's only permeable to water vapour, not to liquid water and (b) the ePTFE is weak unless bonded to something else, and the something else would have to withstand boiling water.
Maybe you want filter paper. Though it's important to note you do want things bigger than water molecules to get through, otherwise you're left without any flavour, which kinda misses the point.
What you really want is filter paper which is permeable to all the flavour elements of tea but not any grot. I believe such purpose-made filters are widely available, with the added convenience that a each filter pre-encapsulates a measured amount of tea. :-p