GreyBird Posted June 6, 2019 Report Share Posted June 6, 2019 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! Link to comment Share on other sites More sharing options...
Mark C. Posted June 6, 2019 Report Share Posted June 6, 2019 Wait until 300 to be safe if its a glaze fire Link to comment Share on other sites More sharing options...
liambesaw Posted June 6, 2019 Report Share Posted June 6, 2019 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. Link to comment Share on other sites More sharing options...
GreyBird Posted June 6, 2019 Author Report Share Posted June 6, 2019 1 minute ago, Mark C. said: Wait until 300 to be safe if its a glaze fire Yes, it's a glaze fire Link to comment Share on other sites More sharing options...
Pres Posted June 6, 2019 Report Share Posted June 6, 2019 As Mark says, 200F.!. . . . 500F.? NO, crazing is more prevalent there. best, Pres Link to comment Share on other sites More sharing options...
GreyBird Posted June 6, 2019 Author Report Share Posted June 6, 2019 OK, well it's 7PM and it's only at 400°. I guess this is going to have to wait until tomorrow morning. Link to comment Share on other sites More sharing options...
Stephen Posted June 6, 2019 Report Share Posted June 6, 2019 seeing it sooner is never worth messing up a load over. I've always turned vent off when cracking the lid and removing plugs since it will draw in the room air. Link to comment Share on other sites More sharing options...
neilestrick Posted June 7, 2019 Report Share Posted June 7, 2019 I usually open my lid wide open at 300F. Link to comment Share on other sites More sharing options...
LeeU Posted June 7, 2019 Report Share Posted June 7, 2019 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. Link to comment Share on other sites More sharing options...
Bill Kielb Posted June 7, 2019 Report Share Posted June 7, 2019 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. Link to comment Share on other sites More sharing options...
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