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Lab talk, the good, the bad, and the ugly
Metal
Hairline fractures on devesting
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<blockquote data-quote="JMN" data-source="post: 109619" data-attributes="member: 8469"><p>It's a phosphate bound investment, so it self heats to ~ 200 F before we put it in. The oven temp was 820 C.</p><p>We've historically had good success with those timings. We've pushed to 15/15/cast/quench before if there was a real time issue with nary a problem. Oh, it's a belle de st claire/kerr ovoid ring too, not cylindrical. The thickness was about 3 tenths mm(is that 300 microns?),usually if they're too thin, what we've seen is, they just develop a "hole". This crack was avout 3mm long buccal to lingual, .15mm wide about 1.5mm from the connector.</p></blockquote><p></p>
[QUOTE="JMN, post: 109619, member: 8469"] It's a phosphate bound investment, so it self heats to ~ 200 F before we put it in. The oven temp was 820 C. We've historically had good success with those timings. We've pushed to 15/15/cast/quench before if there was a real time issue with nary a problem. Oh, it's a belle de st claire/kerr ovoid ring too, not cylindrical. The thickness was about 3 tenths mm(is that 300 microns?),usually if they're too thin, what we've seen is, they just develop a "hole". This crack was avout 3mm long buccal to lingual, .15mm wide about 1.5mm from the connector. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Hairline fractures on devesting
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