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Mushrooms, Mycology and Psychedelics > Advanced Mycology
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Re: Jars cracking in Pressure Cooker [Re: Seuss]
    #541920 -

I had this problem. I switched to a guaged PC. Then I used warmer water when making the substrate. and I also elevated the jars from the bottom to about 2 inches. This solved it for me. I use ball jars.


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Keep it ReaL.

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Re: Jars cracking in Pressure Cooker [Re: Seuss]
    #542008 -

Azure I have an All American PC too, and it does the exact same pop sound I think you are describing. I have never had a jar crack before though, so I do not think that sound you are hearing has anything to do with it.


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"...Three geese in a flock. One flew east, And one flew west, And one flew over the cuckoo's nest."
Ken Kesey

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Re: Jars cracking in Pressure Cooker [Re: dave]
    #542019 -

I'm a dave who uses golden harvest jars too. Out of 36 brand new jars, 4 cracked during sterilization. The cracks aren't that bad, so I will try to colonize anyway. I don't think they will make another run though.


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"there's only one, but there's really two............"

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Re: Jars cracking in Pressure Cooker [Re: CuckoosNest]
    #545650 -

Thanks Cuckoosnest, that's very helpful.
Urban-I'll try your idea and see if that's the problem.

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Re: Jars cracking in Pressure Cooker [Re: Azure]
    #548429 -

I've finally made a batch in which no jars cracked. I don't get it at all, but the temperature of my kitchen has increased from 55 degrees F to 70 degrees F. There's no longer an extreme temperature change when the jars are cooling in the cooker.

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Re: Jars cracking in Pressure Cooker [Re: Azure]
    #548434 -

See, that's what I don't get...

I put my PC in a sink of cold water to depressurize it and have never had that happen....mysterious!


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Freedom defined is freedom denied.

Nighted is better than Google. Please take time to rate 5/5. Thanks!

Edited by Nighted (02/11/02 10:14 PM)

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Re: Jars cracking in Pressure Cooker [Re: Azure]
    #21190244 -

Azure said:
Since there isn't much water in the pressure cooker to start with, it boils within two minutes of being placed on the burner


That's when your jars crack, before you even reach pressure.

Just as you need a slow cooling, you also need a slow heating. If you heat your jars to boling in 2 minutes, they will reach that temperature on the outside of the glass, but the inside layer of glass will still have substrate(room?) temperature. This teperature gap within the glass only happens when heating rapidly or cooling rapidly, since glass does not conduct heat well. This dilation of the outer layer, while the inner layer is contracted, causes huge internal tension in the glass, making it shatter.

The outer bottom of the jar traps some hot steam, making them heat faster, and will generally have better thermal contact with the cool contents of the jar as well, which explains why they are breaking at the bottom.

You need to warm up your jars slow enough, so the contents touching the glass have time to warm up at the same pace with the glass. 2 minutes is way too fast, and you know that if you cooled them in 2 minutes, from boiling to room temp, with running cold tap water, they would shatter. It works the same when heating them up.

PS for those who will cry necro: answering for the readers, not for the posters.

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Mushrooms, Mycology and Psychedelics > Advanced Mycology
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