GC EUROPE Fujivest Super User Manual
Page 22
22
3.3 Selecting the Correct Burnout Procedure
Burning out immediately after the 20 min initial
set has a positive effect as the retained moisture
within the investment material stimulates the
production of steam, this creates an even heating
of the mould and encourages a highly effective
elimination of the wax residue. It is therefore
highly recommended to start the burnout
procedure at this point, either by the quick or
conventional step heating technique.
It should also be noted that the highest strength
(robustness of the investment mould) will always
be obtained by using the quick technique.
When a large amount of pattern resin and / or
prefabricated resin parts are used it is advisable
to use the step heating method, this allows the
resin to get an adequate burnout time (resin
materials normally burn out between 220-270°C).
If this is ignored there is a risk of the resin
expanding in an uncontrolled manner causing the
mould to crack.