<prompt> Investment material used for high fusing base metal partial denturesGypsum bonded.Phosphate bonded.Silica bonded.All of the above.  <response>: 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 1200C 