Is the jar ok if the lid pops before i start the pressure canning? [closed]

What does it mean when the jar pops before pressure canning?

Best Answer

Before they are sealed, canning lids pop. That is, the raised button in the middle of the lid can be depressed.

Sealing the lids involves heating the contents of the bottle which, when it cools, creates a vacuum that sucks the lids in. That vacuum is entirely responsible for the seal that keeps canning lids on. If the seal is broken or failed to form the lid won't be sucked down and will pop.

(Before consuming bottled food always check the seal to make sure the food inside was properly preserved.)

Pressure canning, besides sterilizing the contents of the jar, is also responsible for sealing the jars. There is no reason to expect the jars to be sealed before this step. In fact, the jars won't seal until they have cooled down after the pressure canning. My favorite part of canning is when the jars are all set out to cool and the lids start loudly popping as the vacuum forms and suck the lids down.

If after pressure canning the lids still pop then they failed to seal and that is a new question. Dlb commented above on reasons that might happen.

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Is the jar ok if the lid pops before i start the pressure canning? [closed] - Close-Up Photo of Sugar Cubes in Glass Jar

Is the jar ok if the lid pops before i start the pressure canning? [closed] - A Candle in a Jar

Is the jar ok if the lid pops before i start the pressure canning? [closed] - Clear Airtight Canister With Brown Liquid

Why are my canning jars popping?

When you're taking your jars out of the canner, sometimes they will immediately start popping. Generally, you'll put them on the counter and after a few minutes, they'll start popping. The popping sound when canning is a good thing IF it indicates that this lid is popping down. Just leave the jar on the counter.

Do all canning lids pop when sealed?

If it pops up and down, it is not sealed, and you must refrigerate or reprocess the contents immediately. You can also check the seal by removing the ring and grabbing the lid with your thumb and middle finger. If you are able to pull it straight up, it is not sealed; otherwise a proper seal has been achieved.

What is a false seal in canning?

A false seal is a weak seal that can happen for a number of reasons. False seals occur when the products are not canned correctly, when jar rims are not wiped clean before processing, or if jars are not filled correctly.

Can jars explode while canning?

Sudden change in temperature create too wide a margin between temperature of filled jars and water in canner before processing. That leads to "thermal shock" in the glass jar. Food was packed too solidly or jars were overfilled. Then as the jars heat in the canner, their contents expand and the jar breaks!

Are Canning Lids Supposed to Pop?

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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