For what time is a cast kept immersed in sodium silicate solution for salvaging?(a) 1 hour to 3 hours(b) 2 hours to 4 hours(c) 3 hours to 5 hours(d) 4 hours to 6 hoursThe question was posed to me in quiz.Query is from Salvaging Techniques in division Salvage of Defective Castings of Casting-Forming-Welding I

For what time is a cast kept immersed in sodium silicate solution for

1.	For what time is a cast kept immersed in sodium silicate solution for salvaging?(a) 1 hour to 3 hours(b) 2 hours to 4 hours(c) 3 hours to 5 hours(d) 4 hours to 6 hoursThe question was posed to me in quiz.Query is from Salvaging Techniques in division Salvage of Defective Castings of Casting-Forming-Welding I
Answer» Correct CHOICE is (b) 2 hours to 4 hours Explanation: In impregnation TECHNIQUE of SALVAGING casts, the MATERIAL has to be kept immersed inside the sodium silicate solution at a temperature between 175°F to 200°F, for about 2 hours to 4 hours.

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