Investment material used for high fusing base metal partial dentures
Silica bonded
• Silica is the binder which may be derived from ethyl silicate or silica gel
• Used for high fusing base metal partial denture alloys
• In addition to setting shrinkage "green shrinkage" occurs due to loss of alcohol and water from the gel.
• The investment can be heated upto 1200°C
Gypsum bonded.
Phosphate bonded.
Silica bonded.
All of the above.