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Blisters, spalling
Figure 28: blisters, spalling
Flask has been heated too
rapidly during de-wax.
Do not exceed 150 ºC during de-wax. Wax will
boil and erode investment surface.
Flasks overheated during burn
out.
Ensure maximum burn out temperature does not
exceed 730 ºC.
Flasks put in furnace too soon
after investing.
Leave flasks undisturbed for a minimum of one
hour before de-wax.
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