This question gets asked more frequently than usual with the recent canning jar and canning lid shortages. While we do address the answer in a couple of other larger posts, we thought it was time to re-visit the topic.
If you were to ask us “Can I reuse canning lids?” we could assume that you’re referring to whether or not you can use the same lid in two rounds of canning. If you are talking about a standard 2-piece metal canning lid system, the answer is “no”. If you’re talking about a single-piece Hi-Heat plastisol lid, the answer is “no”.
There are 3 basic reasons why you shouldn’t reuse canning lids:
Manufacturers have designed 2-piece lid systems (and the one-piece lids) for single use processes, so anything outside of the intended use it at the individuals risk. There are limits to the life/functionality of the plastisol liner on those lids. Stressors like heat, acid, time take their toll.
For all of the reasons above, the NCHFP will not recommend reusing canning lids.
Chances are, if you’re a preserver, you also use mason jars in other areas of your life too! These are easy ways to give those lids another use before they begin to rust or soak up too much pickled aroma and are ready for disposal.