CRISOLES
CRUCIBLES
ZIRCONIUM Zr
THE ZIRCONIUM unalterable in the air and clean, resistant up to 550 °C in an oxidi- zing atmosphere at 1500 °C in inert gas (argon or nitrogen), in many cases to replace platinum crucibles in all melting and in particular the sodium peroxide and carbonates. About 100 melting per crucible, making them very economical with reference to the others, either porcelain crucibles, steel or nickel. Resistant to most alkali solvents (Na, K, Li), carbonates, hydroxides, peroxides, borates, nitrates, chlorides, some fluorides and sulfuric acid up to 75% concentrate.
Hydrofluoric acid attacks it.
