What are the different forms of glass??
Different Forms of Glass:
Glass is marketed in various commercial forms to suit varying field requirements. Some important commercial forms of glass are discussed below:
This is the variety most extensively used in engi-neering works. It is available in various thicknesses ranging from 2 mm to 6.5 mm and up to 1750 × 1100 mm size. Following three classes of it are produced:
Ordinary Glazing Quality (O.Q):
It is used for general glazing.
Selected Glazing Quality (S.Q):
It is better than O.Q and is used for better quality work.
Special Selected Quality (S.S.Q):
It is used for superior qualitywork as for show cases and cabinet making.
It is used for glazing of doors, windows and for partitions.
It is made in thicknesses varying from 3 mm to 22mm and sizes up to 2750 × 900 mm. It is stronger and more transparent than the sheet glass. It is ground and polished.
Following three classes of it are produced:
Ground Glass Quality (G.G):
Used for cabinets, show cases, shopfronts, counters and shelves.
Selected Glazing Quality(S.G.):
Mostly used in making mirrors.
Special Selected Quality(S.Q.).
Superior quality for high classwork wind screen of vehicles.