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Does the lower egg half expand when hot?
Comments
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Smolder said:I would think that if the egg is expanding/contracting, there would be cracks in the glaze. I've had my egg for 25 yrs and the glaze looks like the day I bought it.______________________________________________I love lamp..
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Smolder said:I would think that if the egg is expanding/contracting, there would be cracks in the glaze. I've had my egg for 25 yrs and the glaze looks like the day I bought it.There's no very fine hairlike lines/spider webbing (looks like scratch marks) all over your glaze?Most will have those marks and they are called "crazing" and is a fairly normal thing. Crazing is caused when cooling and the glaze is in tension as it cools/shrinks more quickly than the ceramic - thus you get those hairlike cracks.“Reality is that which, when you stop believing in it, doesn't go away.” ― Philip K. Diçk
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There is lots of science in choosing the right formulation of glaze so that it matches the coefficient of thermal expansion of the ceramic. Otherwise you will get failure. Bad crazing is failure, at least when it comes to things like clay pottery, coffee mugs, etc.XL BGE and Kamado Joe Jr.
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speed51133 said:There is lots of science in choosing the right formulation of glaze so that it matches the coefficient of thermal expansion of the ceramic. Otherwise you will get failure. Bad crazing is failure, at least when it comes to things like clay pottery, coffee mugs, etc.
Now I have to know how well the glazing on my coffee mug would fare if I build a 1200°F fire inside it and then let it cool down - crazing or no crazing???
“Reality is that which, when you stop believing in it, doesn't go away.” ― Philip K. Diçk -
speed51133 said:thanks for the flagcanuckland
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Canugghead said:speed51133 said:thanks for the flagThe reason we’ve been seeing an uptick in flags recently.
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HeavyG said:Smolder said:I would think that if the egg is expanding/contracting, there would be cracks in the glaze. I've had my egg for 25 yrs and the glaze looks like the day I bought it.There's no very fine hairlike lines/spider webbing (looks like scratch marks) all over your glaze?Most will have those marks and they are called "crazing" and is a fairly normal thing. Crazing is caused when cooling and the glaze is in tension as it cools/shrinks more quickly than the ceramic - thus you get those hairlike cracks.
Actually, no. I looked closely at it last night to make sure. This egg has sat out for over 20 years uncovered through Kansas winters/summers. I just did a thorough cleanup/rebuild (new gasket/hinge, cleaned and waxed outside) on it before I moved it into it's new home last summer. Glaze is perfect.
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the crazing seems to be luck of the draw. some do others dont. i have 2 larges, one is crazing
fukahwee maineyou can lead a fish to water but you can not make him drink it -
fishlessman said:the crazing seems to be luck of the draw. some do others dont. i have 2 larges, one is crazingMy data sample size isn't very large (maybe a couple dozen) but every BGE, KJ, and Primo I've ever looked at closely had crazing.Maybe it's only a problem if you have ever run a 900°F+ fire, in the middle of winter, while it is snowing, and the moon is full???“Reality is that which, when you stop believing in it, doesn't go away.” ― Philip K. Diçk
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i have an xl egg and a Joe Jr. The Joe has been fired up 3x and has as much crazing as the 3 year old egg (lots). I have gotten the egg to 900F and the Joe to about 400F.XL BGE and Kamado Joe Jr.
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Dude from Facebook claims to have had a 1/2” air gap all the way around sitting on a paver. Left vents open accidentally, woke up to this. Reminded Me of this thread.XL & MM BGE, 36" Blackstone - Newport News, VA
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Wow, scary stuff. Hate to think how things might have turned out of it was situated flush to the house.Stillwater, MN
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johnnyp said:Dude from Facebook claims to have had a 1/2” air gap all the way around sitting on a paver. Left vents open accidentally, woke up to this. Reminded Me of this thread.
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johnnyp said:Dude from Facebook claims to have had a 1/2” air gap all the way around sitting on a paver. Left vents open accidentally, woke up to this. Reminded Me of this thread.
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Exactly. Sitting the egg on a paver is NO air gap. You should have 2 in under the egg. Totally different issue.XL BGE and Kamado Joe Jr.
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stlcharcoal said:johnnyp said:Dude from Facebook claims to have had a 1/2” air gap all the way around sitting on a paver. Left vents open accidentally, woke up to this. Reminded Me of this thread.Retired Navy, LBGE
Pinehurst, NC -
i dont see a screen in that lower vent
fukahwee maineyou can lead a fish to water but you can not make him drink it -
Almost devastating!
1 LBGE, 1 SBGE, 1 KBQ and a 26" Blackstone near Blackstone, Virginia -
Wasn't the gap, it was the paver. Conducted heat down to the wood it was sitting on. Enough tables have burned up now that you'd think people would realize concrete is a conductor, not an insulator.
Just a reminder when thinking about the set up under an egg:
Thermal Conductivity -k-W/(m K)Air 0.02
bricks, insulating 0.15
Concrete, medium 0.40 - 0.70
Cordierite 1.6 - 3.0
Granite 1.7 - 4.0
Cheapest and BEST is an air gap. Always use and air gap and add other as you want.
Southeast Florida - LBGE
In cooking, often we implement steps for which we have no explanations other than ‘that’s what everybody else does’ or ‘that’s what I have been told.’ Dare to think for yourself. -
StillH2OEgger said:Wow, scary stuff. Hate to think how things might have turned out of it was situated flush to the house.canuckland
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Canugghead said:StillH2OEgger said:Wow, scary stuff. Hate to think how things might have turned out of it was situated flush to the house.Stillwater, MN
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