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The part about inert gases caught my attention. When we needed an inert gas when producing silicon ingots to produce solar cells at BP Solarex, we had a couple of choices. Our stations peaked at 1600 degrees Celsius and ran for a 36 hour cycle to produce a 175 lb ingot. We used nitrogen, argon, helium, or sometimes CO2. There could be a difference in yield but we add options so we could maintain production.