Tacho
National Hazard
Posts: 582
Registered: 5-12-2003
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Phosphate bonded cements.
I use dentist´s casting investment to make refractory bits and pieces. You use it as plaster of paris (gypsum), but it resists very high
temperatures. It is called a “phosphate bonded” investment. I PRESUME (as in: I´m not sure) it has retains no water of hydratation after it´s
hard and heated, opposite to plaster of paris or portland cement.
Could anybody confirm this?
I ask because I presume that, holding no water of hydratation, it would be a good insulator for high voltages at high temperatures.
Just to make sure you know what I am talking about, I add some links:
http://r-curtis.umds.ac.uk/bds3a/Investment%20materials%201....
http://www.spofadental.com/ostatni-gb.htm
http://www.servo-dental.de/enpages/labline/guss.html
http://www.rutenium.com.br/inglesteste/pdf/choquetermicoIngl...
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axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
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Check out my V2O5 thread in the Reagents section. I've acquired 500g of the stuff (for FREE!) and am going to experiment with it.
Edit: It's called "GC Fujivest Super" and is made in Belgium.
[Edited on 2004-3-4 by axehandle]
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
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axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
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Mood: horny
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Resistance to SO2 / SO3
I wonder if the phosphate bonded cement is resistant to SO2 and SO3. If it were, I could embed the heating wire on the <b>inside</b> wall
of the catalyst tube, and then cover it with a thin layer of the cement.
Anyone who knows?
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
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