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At what temperature, is sodium silicate immersed in the cast for salvaging?

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in Casting-Forming-Welding I by (687k points)
At what temperature, is sodium silicate immersed in the cast for salvaging?

(a) 125°F

(b) 175°F

(c) 225°F

(d) 275°F

The question was asked in an interview for job.

My doubt is from Salvaging Techniques in division Salvage of Defective Castings of Casting-Forming-Welding I

1 Answer

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Best answer
The correct choice is (b) 175°F

The explanation is: Sodium silicate is a type of impregnant, used for salvaging. The use of sodium silicate to immerse in the cast is termed as impregnation. The temperature at which this immersion should take place is between 175°F to 200°F.

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