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does jam jar size matter?

Posted by thefishers OH (My Page) on
Thu, Apr 26, 12 at 11:52

I'm planning on canning some jam as fruits come into season this year. We eat loads of jam.

All of the jam canning recipes always call for 8 oz jelly jars. Is it OK to use bigger jars - say 16 oz pint jars?

The canning recipes always warn not to changing anything for food safety reasons. I'm wondering if the time in the steam bath has to change depending on jar size?

thanks!


Follow-Up Postings:

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RE: does jam jar size matter?

if the time in the steam bath has to change depending on jar size?

Steam bath???

Most all NCHFP jam/jelly recipes are for either half-pints or pints and the BWB processing is the same.

As long as it is an acid fruit recipe rather than one of the low acid fruits then it will make little difference safety wise. Quality may suffer with some of the more complex recipes if you increase the jar size.

Dave


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RE: does jam jar size matter?

16 ounce of 1 pint canning jars use the same processing time for jams as do 8 ounce jars. I usually always use 16 ounce jars because of the increasing costs of lids (1/2 as many with double sized jars).
I process jams for 10 minutes to eliminate need to sterilize jars.
Now, this is the rule with jams because it is a high acid food and you are processing it to kill any molds that might develop. You are not at risk from the bad boys that you might find in a low acid food like green bean or corn.
So make jam in pint jars to your hearts delight without worry of any kind.
Jim in So Calif


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RE: does jam jar size matter?

  • Posted by morz8 Z8 Wa coast (My Page) on
    Thu, Apr 26, 12 at 20:39

When I'm not gifting them and am out of jelly jars, I will use my everyday wide mouth (16 oz) pints for jelly and jam....The finished product is fine and DH doesn't mind a bit what his jam is processed in or what kind of jar he is opening :)

As above, 10 minutes BWB so I don't have to sterilize jars.


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RE: does jam jar size matter?

You can get softer jams in the pints.

Also, I hope you are not using a steam canner as they are deemed unsafe for canning of any foods.


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