Question

What is meant by annealing of glass? Name the four types of glass. write any one use of every type of glass.

Answer 1

Annealing of glass - "The process by which the prepared hot glass materials are cooled gently with a uniform speed, is called annealing of glass"

Sr. No.	Type of Glass	Use
1	Soda Glass (Soft Glass)	In making crockery, bottles, mirrors, window glass, light bulbs, etc.
2	Potash Glass (Hard Glass)	In making laboratory apparatus
3	Pyrex Glass (Heat resistant Glass)	In making laboratory apparatus, oven, utensils, etc.
4	Optical Glass	In making lenses of optical instruments prisms, lenses of spectacles.
5	Photochromatic Glass	In making lenses of sun gogles, Photo camera, etc.
6	Crooks Glass	In making lenses of spectacles and to check ultraviolet rays.
7	Coloured Glass	in making artificial jewels, gems, window glass and decorations
8	Lead crystal Glass	In making decorations
9	Glass fibres (glass wools)	Used in making medical instruments, refrigerators, optical cables, fibre sheets.
10	Safety Glass	In making air proof curtains of trains, aeroplanes, car, bus, truck, etc.