System
description
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2019-10-16
4
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But it is also possible to push this cycle. Here a recommendation of a RAPID firing cycle:
Figure 20: Rapid firing cycle
Caution:
In case of a “gentle”-firing cycle all amenities of the investment material are pre-
vented from dam
age. A rapid firing cycle doesn’t take care on these amenities. Already
aged investment powder or thus of lower quality can react because of gruff handling with
cracks.
In the dental field,
most people are using “SPEED”-investment material. The fresh invest-
ed flask can be set into the HOT furnace directly. After 1-hour the flask is ready for cast-
ing. Please ask a Dental Depot about this investment material.
Standard-burnout-cycle for gipsum: (from investment to casting 6.5 hrs)
Resting time after investment 30 min,
in 2 hrs (2.5 °C/min) to 300 °C, holding time 30 min,
in 2 hrs (6 °C/min) to 730 °C, holding time 30 min (with flasks Ø 65 mm x 80 mm and Ø 80
mm x 80 mm should the holding time be extended to 60 min verlängert werden) and
in 30 min (4.3 °C/min) to 600 °C, holding time 30 min.
Rapid-cycle gipsum: (from investment to casting 3 hrs)
Resting time after investment 30 min,
in 30 min (10 °C/min) 300 °C, holding time 30 min,
in 30 min (14.3 °C/min) auf 730 °C, holding time 30 min (with flasks Ø 65mm x 80 mm and
Ø 80 mm x 80 mm should the holding time be extended to 45 min) and
in 10 min (13 °C/min) to 600 °C, holding time 20 min.
730
Casting temperature
300
0,5
1
1,5
2
Te
mp.
Time
in h
RAPID firing cycle for flasks MC16 gypsum bonded investment material
3
