Glass Manufacturing

Commercially produced glass can be classified as soda-lime, lead, fused silica, borosilicate, or 96 percent silica. Soda-lime glass, since it constitutes 77 percent of total glass production, is discussed here. Soda-lime glass consists of sand, limestone, soda ash, and cullet (broken glass). The manufacture of such glass is in four phases: (1) preparation of raw material,(2) melting in a furnace,
(3)forming and(4)finishing.

Glass has been manufactured in New Zealand for over one hundred years, and is a
common part of our daily lives. It is used commonly in windows, bottles, jars and
domestic glassware, as well as as a material for artwork, such as stained glass. It is manufactured from cheap and abundant raw materials, and is readily recycled.