Amann Girrbach girobond nbs Instrucciones De Uso página 29

PROCESS STEPS IN THE DENTAL LABORATORY
Casting (Casting temperature approx. 1510 °C, melting interval
1350 – 1422 °C)
When the melting pots are preheated in the furnace, the melt-
ing process can be shortened.
▷ Do not use melting pots for other alloys.
▷ Do not overheat alloy.
▷ Only cast new metal to ensure alloy properties and for
clear batch traceability.
▷ Place Girobond NBS casting cylinder in a ceramic melting pot
(1 cube ~ 6 g).
For open flame casting:
▷ Adjust fuel gas/oxygen ratio:
Propane-oxygen ~0,7 : 1.4 bar
Acetylene-oxygen ~0.7 : 0.7 bar
▷ Do not move flame away from the alloy during the melting process.
▷ When the last casting cube has joined the molten material and the
molten material tears apart and the surface is glossy: draw off
immediately.
For high-frequency casting machines:
▷ When the last casting cube has joined the molten material and the
molten material tears apart and the surface is glossy: Initiate cast-
ing process.
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