Question

Temperature of hot-end treatment is glass is around ______

(a) 300°C

(b) 450°C

(c) 250°C

(d) 550°C

This question was addressed to me in an interview for job.

This interesting question is from Surface Treatment of Glass in section Glass Packaging Materials of Food Packaging Technology

Answer 1

The correct option is (d) 550°C

To explain I would say: In hot-end treatment (typically carried out while the glass container is at 550°C), vapor containing tin or titanium (generally in the form of a tetrachloride) is brought into contact with the outside of the container, forming a thin unimolecular film of metal oxide.