Which of the following investment material can be heated up to 1200 degrees centigrade?
Correct Answer: Silica bonded
Description: When the ethyl silicate–bonded investment is heated to a sufficiently high temperature, some silica converts to quartz and provides added expansion. This type of investment can be heated to between 1090 °C and 1180 °C and is compatible with the higher-fusing alloys.
Note- Phosphate bonded investment is heated upto 1050 °C.
Closest answer is silica bonded investment materials.
Phillip's Dental Materials ed 12 pg 226
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Dental
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