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Spectrum 96 nuggets/ bubbles
Posted: Sun Aug 18, 2013 2:47 pm
by Ron Behrens
If I am casting a glass blank 14 x 1.5 inches and I soak at temperatures somewhere between 1600 and 1900degrees will the bubbles "eventually " all rise to the top? 24 hours time? Or will more be created by some volatile substance in the spectrum 96?
Ron
Re: Spectrum 96 nuggets/ bubbles
Posted: Sun Aug 18, 2013 3:53 pm
by GuyKass
The nuggets are typically furnace glass for blowing (and obviously some furnace castings.)
The suggested temps are (right off of Spectrum's website):
Studio Nuggets: Melting Guidelines
Melt at 2200ºF (1204ºC) in 25 pound charges. Wait until surface has leveled off, then charge again. Soak at 2100º to 2200 F (1144 to 1204ºC) for 2 or more hours. Ramp down as slow as your scheduling permits to your desired working temperature. Common working temperatures are 2075º to 2125ºF (1135 to 1163ºC).
“Squeezing” the glass 50 to 100 degrees below working temp will help facilitate a seed-free melt.
You may want to go to
http://talk.craftweb.com as they are discussed a lot, and a lot of people there have experience using them.