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Amazon Shop: ½ Pint Jars, Brown Rice Flour, Pressure Cooker, Vermiculite

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InvisibleMmkay
newbie
Registered: 05/12/02
Posts: 47
Exploding Jars!
    #1110771 - 12/04/02 07:12 PM (15 years, 8 months ago)

A few days back I pressure cooked 6 1/2 pint BRF jars at 15psi for 45 min. When I opened the PC I was surprised to see verm and 2 broken jars. The water level was just below the lid bands when I started, the PC was dry when I opened it.

I just PC'd some jars a few week ago and didn't have this problem. ANy suggestions on what I did wrong?


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OfflineSHR00M0L0GIST
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Registered: 11/27/02
Posts: 635
Loc: Mescaland
Last seen: 7 months, 7 days
Re: Exploding Jars! [Re: Mmkay]
    #1110791 - 12/04/02 07:16 PM (15 years, 8 months ago)

well it seems like all your water evaporated somehow and then the jars got too hot and cracked. Most glass has air bubbles in it even if you can't see them. When all the water evaporated the glasses got so hot that the air in the air bubbles expanded till they popped causing the glass to break.


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InvisibleMmkay
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Registered: 05/12/02
Posts: 47
Re: Exploding Jars! [Re: SHR00M0L0GIST]
    #1110801 - 12/04/02 07:21 PM (15 years, 8 months ago)

Ya, I figured that. I'm curious as to why all the water evaporated. It didn't last time, and there was hardly any room to add more unless I covered the jars in water....


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InvisibleTinMan
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Registered: 10/01/02
Posts: 2,956
Loc: Russia
Re: Exploding Jars! [Re: SHR00M0L0GIST]
    #1110805 - 12/04/02 07:22 PM (15 years, 8 months ago)

If they were airtight, then the boiling would have caused extemely high pressure on the jars which had a low pressure inside. Nothing is pressure-resistant, so the high pressure will press on the jars until it gets in, which will be done by the jar breaking.


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Offlineoligopolous
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Registered: 12/04/02
Posts: 4
Last seen: 15 years, 8 months
Re: Exploding Jars! [Re: TinMan]
    #1110908 - 12/04/02 08:00 PM (15 years, 8 months ago)

Sealed jars wouldn't have a low pressure inside unless they were dry, the pressure around the jar would equal the pressure intside. I think it probably happened because your cooker did not get an air tight seal, perhaps causing a higher pressure inside the jars or in air bubbles in the glass itself.

Guess it doesn't really matter how you jars exploded, just make sure your PC gets a good seal when you close it.


Edited by oligopolous (12/04/02 08:01 PM)


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Amazon Shop: ½ Pint Jars, Brown Rice Flour, Pressure Cooker, Vermiculite

Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

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