Type of glass

Special use

Soft glass

Ordinary glass for window panes, test tubes, bottles, etc.

Hard glass

For combustion tubes and chemical glassware

High refractive index glass (Flint glass)

Lead oxide, K₂CO₃

For making lenses cut glasses

Pyrex glass

Na₂CO₃, Al₂O₃, B₂O₃ or borax, sand

For high quality glass apparatus cooking utensils

Crook’s glass

K₂CO₂, PbCO₃, CeO₂, sand

Absorbs ultra violet rays, for making lenses

Jena glass

Zinc and Barium Boro silicates

It is resistant to heat shock and common reagent. It is used for making good quality of glass wares.