Switching to Weck Jars

Asked December 2, 2019, 6:03 PM EST

I am switching from Ball/Kerr Jars to Weck Mold jars which can handle the contents freezing without the glass breaking. My pantry is unheated and if someone closes the door in winter - I frequently lose a few jars. I pressure can everything because I don't trust water-bath methods. I am on Backbone Mountain at 2,650' per Google maps. A YouTube video said to process everything 5 minutes longer because of the thickness of the Weck jars. However, I am concerned that my elevation might change that figure. Also, I don't know if that figure was for water-bath canning or pressure canning. So I need to know what changes I need to do to my present recipes because of the switch in jars. And I need a more better source of information than YouTube for this.

Garrett County Maryland

1 Response

Hi Thank you for your question.
A really helpful website for home canning is sponsored by the University of Georgia's Cooperative Extension (UGA). Here is the link to the National Center to Home Food Preservation.


UGA has tested each of their recipes to make sure the processing time, pH, and method (boiling water bath canning/pressure canning) is safe for you. So you may want to checkout their recipes, and know if you follow the directions, and make the altitude adjustments for extra processing time with your elevation, your jars should be safe whether you pressure or use a boiling water bath method.

Right now we recommend home canners to stay away from Weck jars. Mason jars from Ball/Kerr are typically labeled as safe for freezing, but you may want to check with the manufacturer if you have concerns. Here is some additional information about selecting your preserving jars. https://nchfp.uga.edu/how/general/recomm_jars_lids.html

Based on your altitude, you may find this article of interest, for safe preserving. https://nchfp.uga.edu/how/general/selecting_correct_process_time.html

You may want to install a net, or shallow barrier at the shelfs opening so jars don't risk falling in your pantry. This image gives an idea of what I mean. https://www.etsy.com/listing/121759139/stand-alone-canning-pantry-cabinet-using?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_us_e-home_and_living-home_decor-other&utm_custom1=a21a3337-3685-4d71-b2fc-40ff850974ca&utm_content=go_2063581860_76452872775_367965825810_pla-303663660129_c__121759139&gclid=EAIaIQobChMI9OaHqJOc5gIVCmyGCh0YMQbMEAQYAiABEgJ9XfD_BwE