| Usually
caused by |
Cured
by |
|
Rough waxes.
|
Use less
release agent on the rubbers. Can be caused by excess
talc.
|
|
De-wax
temperature too hot.
|
Do
not exceed 150oC during de-wax.
|
|
Steam
de-waxed for too long.
|
Steam,
de-wax for a maximum of 1 hour. Steam will erode surface of
the investment.
|
|
De-waxed
too quickly.
|
Leave
flask for a least 1 hour to achieve maximum strength.
|
|
Flasks
overheated during burnout.
|
Ensure
maximum burnout temperature does not exceed 740oC.
|
|
Metal
too hot.
|
Reduce
casting temperature.
|