Canning Jar Lids
moosemac
17 years ago
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gardenlad
17 years agoRelated Discussions
Canning jar lids - plastic???
Comments (3)Yes, the plastic screw-on one piece covers are not airtight or leak proof. I also place one of the canning metal lids with the rubber seal under the plastic screw on cover. This helps to hold the metal lid in place should it get tipped over in the fridge. The plastic lids are only used AFTER a canning process to help in keeping the metal lid on and not having to deal with the metallic rings that tend to rust quickly. The white coating in the inside of the lid is a plasticized zinc oxide paint. Its inert as far as reacting to any acidic or corrosive action within a canning jar....See MoreReusable canning lids
Comments (29)Bejay, I believe Weck is referring to the French and Italian Bale-Wire Clamp Jars. The French and Italian mechanical devices are left intact even after processing. There is a hinge on one side and if you release the clamp on the other side the seal will probably break. Also - not sure about the seal "pushing out" during processing. Does that refer to the rubber ring? I believe they do recommend using 3 clamps, but not sure if that is to restrict the ring or the pressure inside The ring pushes out. The pressure still must be relieved. Three clamps brings it closer to the American style which has even pressure on the *ring* from the screwed on lid which must be only finger tight. I do like the idea of the food only coming in contact with the rubber ring and lid, which is glass. I know that the Ball metal lids are coated to be relatively safe, but I also am a bit unsure about any foods (especially acid) coming in contact with metal. There shouldn't be any contact with metal even with the metal lids. The metal lids are completely coated with plastic which contains BPA. However BPA bonds break down in an acid environment. Heat facilitates the process. I have seen the failure of the coating in high acid relish after many years of storage. The plastic coating breaks down and then the metal is exposed. The food does not have to be in direct liquid contact. Acid is present in vapor form too. Remove the cap on a jar of vinegar and your nose will tell you acid is present in gaseous form. I will never again can high acid food with BPA coated metal lids. It may take years to expose the metal but the BPA starts breaking down from day one. I don't think there is a question as to whether or not BPA gets in your food. The question is how much and is that small amount enough to be concerned about. When I read that some have reported that parts per trillion is now a risk vs the old parts per billion I became concerned about even the very small amounts introduced with home canning lids. That's about 1000 times less than what was once considered safe. As most of my own canned foods are being constantly monitored for "shelf life" I haven't noted any metallic influence from Ball lids to date. I agree home canning only exposes the lid and is surely a lot safer than food in complete contact. Shorter shelf times can only benefit. However taste is not always a good indicator of safety. Zeuspaul...See Morecanning lids
Comments (28)Balloonflower, here is my experience with using an unused lid for canning, but has been used on storage items... I also use my canning jars for pantry storage of various food items and the wide mouth ones for storing some things in the freezer. I always keep a few of the "good-but-used" lids for these, and mark them with an X if they don't have markings on them already from when they were used in the canner. However, a while back, I ran out of used lids and went into my supply of unused, new canning lids for a temporary dry storage situation. I marked them as unused because I was hoping they would still be valid for canning. As I have recovered them from the storage items, I have used them for canning, but never more than one in a batch, just in case they didn't seal. I have not had any seal failures. I will also say that I used a couple of these for storing some things in the freezer prior to using them for canning, and I had doubts about their ability to work in the canner, but did not have seal failure on those either. After using the new lids for my storage jars, they were run through the dishwasher and dried, then used exactly as a brand new lid when canning, preheating in the pan of water with the other new lids. By having the lids marked as having been used for previous storage (but not canning), I was able to keep an eye on them for thorough inspection after canning. This is just based on my own experience...might not work for everyone. I wouldn't use them on an entire canner load because a failure of a whole load would be a disaster. Try using only l per load so if it doesn't work for you, you only have one jar to use up immediately. Jill...See MoreVintage Canning Jars/Lids Questions
Comments (6)The jars, if in good shape with no rim nicks or cracks of any kind can safely be used IF the 2 part lids will fit on them. Many of us use really old jars. Some of us use them only for BWB recipes rather than pressure canning but some will also use them in pressure canning as all you stand to lose is thejar of contents if they don't hold up to the pressure. The lids are another problem. The bail top jars and gaskets haven't been 'officially' approved for decades now because of the questionable quality of the seals. Like many of the other old time methods of canning they fall into the Equipment and Methods No Longer Recommended category. Only the 2 piece flats and bands are 'officially' approved. But some of us who have some of the old bail type jars do still use them for really high acid foods like pickles. Most just use them for dry storage items like dried beans and such. That type of use is approved. Personally I wouldn't trust them in pressure canning or with low acid or border-line acid foods. If you are just getting back into canning after several years it would pay to spend some time exploring the NCHFP website for all the latest guidelines and information. Start with the FAQs there. Dave...See Moreveggiecanner
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