Ivoclar Vivadent IPS Eris for E2 - Manual (Page 33)

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Divesting
(After approx. 60 minutes)
After cooling, the investment ring may show cracks. These
cracks developed (immediately around the AlOx plunger)
during cooling as a result of the different CTEs of the various
materials (AlOx plunger, investment material, and pressed
materials). They do not compromise the result of the pressing
cycle.
Select the program for the IPS Empress 2 layering technique. Set the exact press parameters. Place the
investment ring with ingot and the AlOx plunger at the center of the EP500/EP600 press furnace. Close the
furnace head. Activate the selected program by pressing START.
Check the vacuum
The press cycle runs automatically. An acoustic signal indicates the end of the press cycle.
Remove the investment ring from the furnace
immediately after the program is completed and
close the furnace. Place the investment ring on a
wide-meshed grid (IPS Empress cooling rack) and allow to
cool to room temperature. The grid ensures quick and even
cooling of the investment ring and prevents undesired heat
accumulation.
Mark the length of the AlOx plunger on the cooled investment ring.
Separate the investment ring using a separating disk. This predetermined breaking point enables reliable
separation of the AlOx plunger and the ceramic material.
Break the investment ring at the predetermined breaking point using a plaster knife.