What is the scientific reason behind why most of canners use this kind of jar and why not the other one?
by NecessarySyllabub639
3 Comments
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Longjumping-Royal730
Not all jars are suitable for processing at home. They could shatter more easily from thermal shock or just break from pressure canning. If it’s the lids you are referring to, a two piece system is to ensure the lid properly seals. Without a removable ring you could not properly check to ensure it has sealed – one piece lids are not safe for home canning.
marstec
Here’s a detailed explanation from a uni extension service:
“One-piece, reusable, and previous used lids are not approved for home canning by the USDA as they may allow air to be trapped within the sealed jar permitting bacteria to thrive and spoilage to occur which can lead to illness and even death. While one-piece lids are available for home canning, they were made for use in industry where very strict time and temperature controls are in place. Because they do not allow air to escape properly in home canning, consumers have reported jar breakage and lids buckling.”
3 Comments
Hi u/NecessarySyllabub639,
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Not all jars are suitable for processing at home. They could shatter more easily from thermal shock or just break from pressure canning. If it’s the lids you are referring to, a two piece system is to ensure the lid properly seals. Without a removable ring you could not properly check to ensure it has sealed – one piece lids are not safe for home canning.
Here’s a detailed explanation from a uni extension service:
[https://blogs.extension.iastate.edu/answerline/2022/03/15/are-two-piece-lids-really-necessary/](https://blogs.extension.iastate.edu/answerline/2022/03/15/are-two-piece-lids-really-necessary/)
Of note from that link:
“One-piece, reusable, and previous used lids are not approved for home canning by the USDA as they may allow air to be trapped within the sealed jar permitting bacteria to thrive and spoilage to occur which can lead to illness and even death. While one-piece lids are available for home canning, they were made for use in industry where very strict time and temperature controls are in place. Because they do not allow air to escape properly in home canning, consumers have reported jar breakage and lids buckling.”