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  #26  
Old 06-11-2019, 02:51 PM
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Richard Huntrods Richard Huntrods is offline
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If something burns on a stainless pot or aluminum baking pan, we boil a solution of baking soda for a few minutes and let cool. Almost always removes the worst, then just some elbow grease and a scrubby.

As for caustics, it also depends on the alkali metal involved. I worked in a research lab in the late 1970's where the main reagent was various concentrations of NaOH, from mild to 18molar (as conc. as you can get it). All were run against a membrane and testing was done at 80C.

I found that at room temp, NaOH, even at full concentration, was more just 'soapy' than any problem. Just wash it off within 30 sec. Same for conc. (18molar) HCl. Any other acid (i.e sulphuric, nitric, or worse)
I was sensible enough not to touch. Likewise any acid or base that was hot.

But then, we washed our hands in benzene in those days. (acetone stripped the oils off your hands but benzene wasn't as 'harsh'). We also used to play with vials of mercury. Fun times.

Sadly, it's probably all the second-hand "weed smoke" that's going to kill me eventually.

Pointless aside for the day: how come you can't smoke anything tobacco, but you can vape tobacco and smoke weed till you can't see anything more than 1 foot away?
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  #27  
Old 06-11-2019, 03:12 PM
Shawn Everette Shawn Everette is online now
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It's cause it's, like, plant medicine...man. Exnay tryin ta harsh ma buzz, brah.
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Old 06-11-2019, 03:21 PM
Shawn Everette Shawn Everette is online now
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While my organic chemistry is generally weak, I try to remain cognizant of the materials I'm using. It's a pity that the days of lab exploration in schools is mostly past. To get kids interested and actually learning they need to do it, not just read about it.
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  #29  
Old 06-11-2019, 05:30 PM
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Pete VanderLaan Pete VanderLaan is offline
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It's already been pointed out. People want answers. not thinking. It's why I thnik frequently about how the last fifty years went awry.

The new stuff Mark and I are looking at, that's thinking forward about casting. Corning would be thinking differently. At one point I proposed a process they liked, byt rejected since it only increased the sales 8 mil.


This is why you're here, not there.

Life is not only short, it's never fair.
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Old 06-21-2019, 02:37 PM
Henry Halem Henry Halem is offline
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[quote=Greg Vriethoff
My own thoughts on this are that sticking is often caused by the glass being too hot, and fusing with the silica in the investment. You may be able to remove the foreign matter stuck to the surface, but there will still be a blemish. In other words there is no chemical fix for this, and coldwork will still be necessary.[/QUOTE]

You took the words out of my mouth Greg.
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Old 06-21-2019, 02:44 PM
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The samples Mark and I have will go off to Corning Monday.
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