<prompt> True about mounting stones isFast settingHigh expansionHigh strengthAll of the above  <response>: The use of an articulator makes it necessary to mount the casts using a gypsum-producing product. These materials are referred to as mounting stones or plasters. They are fast setting and have low setting expansion. The mounting plaster has a sufficiently low strength to permit easy trimming and facilitate separating the cast from the articulator mounting plates.Phillips Science of Dental Materials ed 12 pg 191 