Quartz is added to gypsum bonded investment to______________?
(A) Increase the strength
(B) Counter balance contraction of gypsum during heating
(C) aid in hygroscopic expansion
(D) Increase the shelf life of investment
Quartz is added to gypsum bonded investment to______________?
(A) Increase the strength
(B) Counter balance contraction of gypsum during heating
(C) aid in hygroscopic expansion
(D) Increase the shelf life of investment
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