Some also come with a non-stick (Teflon-type) coating. Zojirushi makes incredibl...

jankeymeulen · on Dec 21, 2022

Good you mention a teflon-type coating in a discussion about 'forever chemicals'.

amluto · on Dec 21, 2022

Zojirushi also makes them without the liner. It’s a choose-your-poison situation: the lined ones seem to perform much better with green tea.

atombender · on Dec 21, 2022

Interesting, I wasn't aware of that. What do you mean by "perform" here?

amluto · on Dec 21, 2022

Green teas seem to stop tasting good after a fairly short time stored in a stainless steel bottle.

selimthegrim · on Dec 21, 2022

Could be the green tea is made with slightly lower temperature water so less likely to leach chemicals off of the liner

amluto · on Dec 22, 2022

In theory the liner is PTFE (or maybe a different fluoropolymer) with nothing left to leach out. PTFE and its relatives are stable to temperatures well above that of boiling water, so leaching shouldn’t be an issue.

(One big problem with PTFE is that it starts to slowly decompose at a lower temperature than its melting point. This makes it messy to work with. As I understand it, the decomposition products are gasses, so this is a problem at the factory and for the environment, but I don’t think its a problem for end users.)