Q. Which of the following is used as protective admixture in moulding sand for magnesium castings? (Solved)
1. Boric acid
2. Sublimed sulphur
3. Fluoric additives
4. Any of the above
- d. Any of the above
1. Boric acid
2. Sublimed sulphur
3. Fluoric additives
4. Any of the above