Berlin Packaging has twelve-ounce, amber, PET Boston bottles for less than a buck each. No caps are supplied. They have available 28-400 and 28-410 caps for around seven cents apiece. These caps are foam-lined. I’m wondering if the foam liner might not contain the carbonation of a properly-executed homebrew. Does anyone here have any experience with foam-lined bottle caps? What did you discover?
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I wouldn’t be comfortable using this to keep beer for a long period of time.
Twist on caps for homebrew don’t seem like the right move.
But, I can see using it as a beer to go solution.
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I have used Mr. Beer and Mr. Root Beer PET bottles many times, and find them to be adequate for all kinds of carbonated beverages. My Mr. Beer caps have a blue plastic liner, and the Mr. Root Beer bottles have a rubber liner.
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I like the white caps we find on Walmart two-liter cola bottles. They have a tapered ring inside that can actually be felt as you force the ring into the mouth when you tighten-down the cap. I have found that the white ones hold carbonation better than the translucent ones we find on Walmart’s one-liter bottles of flavored waters. I believe the translucent ones are too flexible, and such flexibility allows the carbonation to get past the tapered ring that’s also in the plastic used in those caps.
Matt says: “My Mr. Beer caps have a blue plastic liner, and the Mr. Root Beer bottles have a rubber liner.”
I think you mean the mr. beer caps have a light blue silicone sealing ring, while the mr. rootbeer caps have a black nitrile/Buna N gasket. I prefer silicone over nitrile because the silicone is softer and thus-- in my opinion-- better negates any irregularities in the " horizontal flatness" of the mouth of the bottle.
I agree that silicone is wonderful stuff for making seals, but it is much more permeable to oxygen than nitrile so it is not a good choice for long-term storage.