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GreyBird

What temp is it ok to crack the kiln lid?

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I'm tracking temps in my latest firing. I have an old Norman Electric Kiln. I found I needed to slow the heat rise in the last portion of the firing but It cooled steadily at 100° per hour which is plenty slow and that's with kiln vent on. At that rate it should have been cooled to 300° by 2pm today but it seams to have stalled at 11am  around 700° since  at 1pm it was still at 700°.  I opened the vent and still it only dropped 50° in the next half hour to 650° so I also cracked the lid and we're down another 50° in a half hour. I'll check it again in an hour but as it cools the cool down really slows to a crawl! It's killing' me!

Edited by GreyBird
spelling, more info.

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I don't open it until it gets down to 200, only because that's where my kiln basically stays for an entire day if I let it.  I think I've seen that some people crack at 500, but that feels risky to me, I did it once and heard my kiln bricks start to make noise.

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I make myself wait 'til 200. I'm too antsy to risk anything over a few hours of impatience! Mostly this with regard to with New Hampshire winters, which are very cold, for a very long time, and my kiln is on an unheated back porch. 

Edited by LeeU

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Cracked 250 for me but 300 when  in a hurry. 100 degrees an hour initially but as the difference in temp between inside and outside decreases so does the cool down rate which you already figured out no doubt.

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