The glass industry in India is divided into two categories: cottage industry and factory industry.
Under cottage industry, glass bangles are made in small furnaces either from glass blocks produced in factories or from inferior glass manufactured from the impure sands of the rivers and the efflorescent alkali. Flower pots, decorative glassware, tableware’s, lamps and lamp-wares are also produced under cottage industry. Cottage industry, though spread throughout the country, is mainly concentrated in Firozabad (Uttar Pradesh) and Belgaum (Karnataka).
The factory industry is mostly confined to Uttar Pradesh, Maharashtra, West Bengal, Bihar, Jharkhand and Punjab. Ceramic industries in Uttar Pradesh mainly produce sheet glass, hollow and pressed wares (bulbs, chimneys, reflectors and motor headlights), while Bengal and Maharashtra are famous for glass tubes, test- tubes, beakers and flat glass. Punjab predominates in the production of hollowware’s and scientific and precision goods.