Pasteurization and building bottle caps!

[dale1]

Hello, I made a great sweet cider by fermenting to dry and back sweetening with concentrate. After bottling, I let the cider carb for 3 days and pasteurized them (ended up with about 40 pasteurization units).

Anyway, I cracked one open and it was delicious ( a bit hazy since I didn't use pectic or finning). However, I noticed most (not all) of the caps are bulging! They look like they're going to explode! They weren't like that prior to heating for pasteurization.

Is this typical with pasteurization? I'd rather not open to vent if I don't need to. The bottle I opened did not gush and it had a bulging cap. Am I safe leaving them in the fridge? Thoughts?

 

[dale1]

Oops, title should say "bulging" not building.

 

[phug]

The pasteurizing process does temporarily increase the pressure in the bottle. So if you're not leaky and you're not gushing then your caps probably just reshaped a bit while heated and I wouldn't worry about them now


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[dale1]

Ok, that's what I was thinking, but wanted to see if it had happened to anyone else. Thanks!

 

[bernardsmith]

I am curious to know how the bottles turn out after some weeks. If you have any left after a few weeks could you post an update. Thanks.

 

[Jacob_Marley]

yep pressure. That can happen particularly if you've got lotsa pressure to begin with in the bottles.

 

[MarkKF]

Happened to me also. I always thought I got the internal temp to high or didn't have enough headspace.


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