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Lab talk, the good, the bad, and the ugly
Zirconium
Zirconia Opaqueness & Shade Issues
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<blockquote data-quote="JMN" data-source="post: 264142" data-attributes="member: 8469"><p>Does it happen with any pre-shaded materials?</p><p></p><p>Does it happen with every shade, or only certain shades?</p><p></p><p>If multiple techs are staining, is there a shared source for all materials, or per bench/per tech.</p><p></p><p>Since it happens independant of lot #, it will have to be either caused by (or during usage of)</p><p>an oven issue,</p><p>a tech/station/bench specific issue,</p><p>a brush issue,</p><p>a brushed on material issue</p><p>a transport issue</p><p>an environment issue - mill(impurities in airline?new airline/trap/contaminamts in moisture trap. Burrs handled with contaminated hands(unlikely or most would have problems unless it is only ones using a specific burr)) furnace(new doesn't mean known good),or lab ambient.</p><p></p><p>I know some techs will use their mouths to repoint the brush bristles, if that is done there, even a change of lipstick or use of chapstick/lipbalm/cold sore ointment or something similar may be a culprit. Not necessarily by itself, but posssibly in combination with something else that may or may not have changed.</p><p></p><p></p><p>You did great investigations to determine what was not the problem, and [USER=2255]@grantoz[/USER] had it right with firing untouched materials to see what happens.</p><p></p><p>New gloves?</p><p>new bottle of commonly used stain?</p><p>new brush package opened?</p><p></p><p>Something changed, and as you've shown in your dilligence, finding that something is a labourious process sometimes. I know you]ve racked your brain, and I'm hitting you with lots of options, but just keep detailed records of what was handled by who and had what used on it and was where in which furnace for a few days and the answer will reveal itself eventually.</p><p></p><p>Wish you well. And I'm really curious as towhat's happening too.</p></blockquote><p></p>
[QUOTE="JMN, post: 264142, member: 8469"] Does it happen with any pre-shaded materials? Does it happen with every shade, or only certain shades? If multiple techs are staining, is there a shared source for all materials, or per bench/per tech. Since it happens independant of lot #, it will have to be either caused by (or during usage of) an oven issue, a tech/station/bench specific issue, a brush issue, a brushed on material issue a transport issue an environment issue - mill(impurities in airline?new airline/trap/contaminamts in moisture trap. Burrs handled with contaminated hands(unlikely or most would have problems unless it is only ones using a specific burr)) furnace(new doesn't mean known good),or lab ambient. I know some techs will use their mouths to repoint the brush bristles, if that is done there, even a change of lipstick or use of chapstick/lipbalm/cold sore ointment or something similar may be a culprit. Not necessarily by itself, but posssibly in combination with something else that may or may not have changed. You did great investigations to determine what was not the problem, and [USER=2255]@grantoz[/USER] had it right with firing untouched materials to see what happens. New gloves? new bottle of commonly used stain? new brush package opened? Something changed, and as you've shown in your dilligence, finding that something is a labourious process sometimes. I know you]ve racked your brain, and I'm hitting you with lots of options, but just keep detailed records of what was handled by who and had what used on it and was where in which furnace for a few days and the answer will reveal itself eventually. Wish you well. And I'm really curious as towhat's happening too. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Zirconia Opaqueness & Shade Issues
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