They should all be fairly resistant to chemical attack - I know polypropylene and Teflon easily handle HCl, even H2SO4. Bakelite is the part I'm
concerned about, I can't seem to find any information on its compatibilities but it has been stated that it is 'chemical resistant' ambiguously.
Addition polymers, as these all are, are generally good at handling reagents. The ones to avoid are polyesters like PET since they can hydrolyse.
Are your Teflon lined caps like these, I.E a 'spongy' disc? If so, they will be fine, I've got these on a lot of my bottles containing hazardous
reagents and they're untouched. Since your HCl isn't concentrated enough to be fuming, I'd be less worried about the caps deteriorating.
In chemistry, sometimes the solution is the problem.
It’s been a while, but I’m not dead! Updated 7/1/2020. Shout out to Aga, we got along well.
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