I will probably try this experiment but I have not and wonder what is your guess as to what will happen.
I find that grain jars and bags and sub for that matter gain only about 1% water wt when being sterilized in PC or autoclave. Not a problem. But I wonder if I could, in the case of jars, close the lids for sterilization. Would the jars break? What is your guess?
Think about it. The max pressure differential could never be more than +/- 20 PSI and that would only be if there were sudden steam heating and / or decompression. And I think that jars could take 20PSI. But since heating and cooling is gradual, I would think that the pressure differential would be minimal. The jar might be just a bit underpressurized during heating and a bit overpressurized during cooling.
Well, as I was typing this I thought of a reason not to seal the jars. The negative pressure on the lid of a sterilized jar is a visible indicator of a seal and that might not exist if the jar is sealed before autoclave. And I guess a sealed jar would take more time to sterilize and if there was no water in the jar then steam would not form. Steam is an essential part of the sterilization process, not just the temperature and pressure.
My whole reason for even considering this is to not have to worry about screwing down the lids after sterilization. But if one is using relatively new lids with plenty of the red sealant still left then I guess they are self sealing.
Well, maybe I'll try it and report. What's your guess? Broken glass or not?
Edited by raymycoto, 08 April 2019 - 02:16 PM.