Question

The temperature during annealing is around ______

(a) 250°C

(b) 340°C

(c) 540°C

(d) 640°C

This question was addressed to me in semester exam.

I need to ask this question from Manufacture of Glass in portion Glass Packaging Materials of Food Packaging Technology

Answer 1

Correct answer is (c) 540°C

To explain: This is achieved by raising the temperature of the container to approximately 540°C, holding it there for a few minutes and then cooling at a rate which is consistent with the removal of stress from a predetermined wall thickness.