Ivoclar Vivadent PCT FlexVest - Manual (Page 3)

Setting time
At a room temperature of 23 °C (73 °F), the setting time is
approx. 20 to 30 minutes, depending on the size of the
investment ring used (speed burnout). After the thermal reaction
has ended, roughen the surface of the investment. This will aid
in the removal of gases during the first stages of burnout.
Note: Allow the investment to set completely before proceeding
with burnout!
Rapid burnout
Quick heating can be effected up to 8 hours after setting.
Place the investment ring in an upright position in a furnace
preheated to max. 850 °C (1562 °F) with the sprue hole down
and elevated so that the investment ring does not touch the
base plate (spacer), or alternatively, place the investment ring
horizontally. If a higher temperature is required, place the
investment ring in the preheated furnace at 850 °C (1562 °F)
and then raise to the final temperature. The maximum
temperature for the investment material is 1050 °C (1922 °F).
If alloys with lower temperatures are used, place the investment
ring in the furnace at 850 °C (1562 °F) and then decrease the
temperature according to the manufacturer’s instructions.
Note: Please observe the instructions of the corresponding alloy
manufacturer regarding the preheating temperatures.
Holding time
Investment ring size 1 30 – 45 min
Investment ring size 3 45 – 60 min
Investment ring size 6 60 – 75 min
Investment ring size 9 75 – 90 min
Note: If modelling resins which burn out without leaving
residue are employed, the holding time should be increased
by 10 min. Observe the manufacturer’s instructions! If several
investment rings are placed in the preheating furnace at the
same time, the holding time has to be increased accordingly.
Conventional burnout / holding times
Allow the investment material to set for at least 1 hour. Place
the investment ring into the furnace at room temperature.
Increase the temperature as indicated on the chart below.
Cooling / Divesting
After casting the alloy, allow the investment ring to cool to
room temperature. Do not quench in water. Prior to divesting,
wet the investment ring in water to prevent dust from forming.
Use plaster pliers. Do not use a hammer for divesting. Remove
residual investment from the casting by means of an ultrasonic
cleansing solution or careful application of jet polishing
medium/AL
2
O
3
.
Storage
PCT FlexVest Powder and PCT FlexVest LiquidLiquid H.E. should
always be stored in a cool, dry place and the containers should
remain tightly sealed when not in use. The storage and shipping
temperature of PCT FlexVest Liquid/ Liquid H.E. and PCT FlexVest
Powder is 12–28 °C (54–82 °F). The materials are ideally used at
temperatures between 17 and 22 °C (63 – 72 °F).
PCT FlexVest is sensitive to temperatures below freezing point.
Do not use PCT FlexVest Liquid/Liquid H.E. if it exhibits a jelly-
like consistency or crystals. The shelf life of PCT FlexVest Powder
and PCT FlexVest Liquid/ Liquid H.E. is two years if they are
stored according to the storage conditions stipulated.
Warning
Investments contain quartz. Do not breathe dust! Dust may
cause delayed lung injury (silicosis, lung cancer). Use scissors to
cut the pouches open. Prevent dust from forming when pouring
the pouches’ contents into a mixing bowl. Rinse empty pouches
with water prior to discarding them. Always remove dust from
your working space by means of a damp cleaning method.
Immerse the investment ring in water for a short while after it
has completely cooled to prevent dust from forming during
divesting. Use suction equipment with a fine dust filter when
sandblasting the castings.
Material properties (ISO 9694)
PCT FlexVest Liquid PCT FlexVest Liquid H.E.
100 % 100 %
Mixing ratio (100 g : 22 ml) 100 g : 22 ml 100 g : 22 ml
Flow path approx. 14 cm approx. 14 cm
Start of setting time approx. 10 min approx. 10 min
Compressive strength approx. 5 MPa approx. 5 MPa
Setting expansion 1.5 % 1.5 %
Thermal expansion 1.0 % 1.3 %
Delivery forms*
PCT FlexVest Trial Kit (90 g x 4 / 100ml )
PCT FlexVest 4 kg (60 g x 67 )
PCT FlexVest 4 kg (90 g x 45)
PCT FlexVest 4 kg (160 g x 25)
PCT FlexVest 5 kg
PCT FlexVest Liquid 1000 ml
PCT FlexVest Liquid H.E. 1000 ml
PCT FlexVest Dosing bottle
PCT FlexVest Liner 20 m
* The delivery forms can vary in the different countries.
This material has been developed solely for use in dentistry. Processing should be carried out
strictly according to the Instructions for Use. Liability cannot be accepted for damage resulting
from failure to observe the Instructions or the stipulated area of application. The user is
responsible for testing the material for its suitability and use for any purpose not explicitly
stated in the Instructions. Descriptions and data constitute no warranty of attributes and are not
binding.
Note: If modelling resins which burn out without leaving
residue are employed, the holding time should be increased by
10 minutes. Observe the manufacturer’s instructions! If several
investment rings are placed in the preheating furnace at the
same time, the holding time has to be increased accordingly.
Casting
Cast alloy according to the alloys manufacturer’s instructions.
Temperature Temperature Holding Holding Holding Holding
increase time 1x time 3x time 6x time 9x
23–270°C 7–10°C/min
30–60 min 30–60 min 30–60 min 30–60 min
73–518°F 13–18°F/min
270–560°C 7–10°C/min
20 min 20 min 30 min 60 min
518–1040°F 13–18°F/min
from 560°/
1004°F to final 7–10°C/min
30 min 45 min 60 min 60 min
temperature* 13–18°F/min
*(max. final temperature is 1050 °C/1920°F)
PCTFlexVest-VA-WE3.qxd 05.10.2004 14:56 Uhr Seite 3