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At what temperature does the silica sand start expanding thermally?(a) 918°F(b) 843°F(c) 1063°F(d) 1124°FThe question was asked in class test.My doubt stems from Refractory Sands topic in division Molding and Core Sands of Casting-Forming-Welding I

Answer»

The correct choice is (c) 1063°F

Easiest explanation: It is one of the disadvantages of silica SAND, that it has its thermal EXPANSION TEMPERATURE at 1063°F. At this temperature, the VOLUME of the sand starts to INCREASE.



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