Ivoclar Vivadent CosmoPost - Manual (Page 20)

20
Preheating
Parameters
Preheat the investment ring, including the AlOx plunger, but
without the ingot , in a conventional preheating furnace.
Please refer to the Instructions for Use for the IPS Empress 2
Special Investment Material or the IPS Empress 2 Speed
Investment Material for the preheating parameters.
Given the low press temperature required, the IPS Empress
Cosmo Ingot is not preheated together with the investment
ring. The room temperature ingot is placed into the invest-
ment ring when preheating is completed. The material is
then pressed in the EP600 or EP500 press furnace.
Pressing
Switch the furnace on in good time.
Calibrate the furnace regularly. Please see the corresponding
information regarding the calibration of the furnace in the
Instructions for Use of the Temperature Checking Set 2 of
the EP 500 and the Automatic Temperature Checking Set 1
of the EP 600/EP 600 Combi.
Remove the investment ring from the preheating furnace and
place the cold IPS Empress Cosmo Ingot in the ring.
Next, position the AlOx plunger.
Important
Given the similar coefficients of thermal expansion of the
IPS Empress Cosmo Ingots and the AlOx plunger, make
sure to use a clean or new AlOx plunger to prevent the
pressed material from sticking to the AlOx plunger.
Important
– Carefully remove investment material and ceramic
residue from the AlOx plunger after each use. Always
keep the marked side of the AlOx plunger upwards.
– Clean the furnace regularly.
– If desired, preheating in conjunction with the
IPS Empress 2 Special Investment Material (but not in
conjunction with the IPS Empress 2 Speed Investment
Material) may also be performed overnight. Since the
investment material may be prone to crystallization,
however, preheating over the weekend should be
avoided.
Insertion of the cold ingot in the investment ring
Insertion of the pre-heated AlOx plunger in the investment ring
Pressing in the EP 600
Select Program 4 (Cosmo)
Pressing in the EP 500
Pressing temperature: 900 °C/1652 °F
Holding time: 10 min
Heating rate: 60 °C/108 °F min
Post pressing time: 0
Pressing power (indicator): 5 bar
Vacuum on: 500 °C/932 °F
Vacuum off: 900 °C/1652 °F
Stand-by temperature: 700 °C/1292 °F
P
11
11
B
700°C
1292°F
t
60°C
108°F
T
900°C
1652°F
H
10
10
V
1
500°C
932°F
V
2
900°C
1652°F
Pressure
5 bar
5 bar
N
–
–
→