Vegetable Garden Spaghetti Recipe Made With Spaghetti Squash. Repurpose Mason Jar Rings Into Egg Rings. I have to agree. I don't think mason jars use the highest grade materials for being heated to 400°+. I would guess that mason jar lids are composed similar to "tin" cans, which are tin coated steel. The tin (or any other coating, such as zinc, prevents corrosion of the steel. Tin has a very low melting point, about 450°F, but will most likely begin to crack and flake way before this. Luckily, Tin isn't very toxic, although enough can make you sick to your stomach. Totally. The lids to Ball canning jars are made to be boiled during the canning process. Standing up to boiling is very different from standing up to being fried in a skillet. Looking at it another way: Most of the plastic stuff in your kitchen can be boiled for sanitization.
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