Burnout question

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user name

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Ive got to do an ol'skool post and core.

Will PMMA burn out clean if I use a thin piece to reinforce the post?
 
Car 54

Car 54

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Good question. My only thought would be if it's a gold post is to run it up a little higher than normal, hold for a bit to make sure, then to bring the temp down lower
to the recommend 1200? temp. hold for a bit, then cast.

Maybe leave a piece of PMMA on the oven floor, and see what it does and when, as you're doing your burnout?
 
A

adamb4321

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I use pmma sticks for posts all the time, it’ll burn out clean at 600’C (don’t what that is in F) with a 20 minute hold time.
 
Car 54

Car 54

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Right in line with what adam said, here are Ivoclar's instructions for their clear PMMA Cast.

20190908_132719.jpg
 
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doug

doug

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(0°C × 9/5) + 32 = 32°F
(0°F − 32) × 5/9 = -17.78°C


I could link the web address but that would be too easy. You guys have to do a little math once in awhile
 
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JMN

JMN

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Okay, fess up. Who else thought when seeing the title it was about long work hours and too many days of those long hours?
 
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