FLOAT GLASS
This is the most common type of glass which is generally available on glass retail shops for use in the buildings. The stock sheets of glass are cut to size generally on the glass shop itself and supplied to site for glazing in the windows or other applications.
Basic float glass is manufactured by melting sand. Other ingredients such as soda ash, limestone, salt cake and broken cullet glasses are added to lower the melting temperature of silica and promote optical clarity of the finished glass product. Mixed batch of above materials is heated to a temperature of 1450 to 1650º C and formed into large flat sheets by floating molten glass on molten tin, thus giving it precise flatness and transparency.
TINTED FLOAT GLASS :
It is a normal flat glass to which colour is added during manufacturing process to achieve tint and solar radiation absorption properties.
Its absorption properties help diminish energy transmissions through glass when exposed to strong sunlight. Variations in the thickness of the glass would yield different performance in terms of light and solar transmission.
Although darker shades reduce the amount of heat being transmitted to the interiors, they also reduce the amount of daylight being transmitted.
ONLINE COATED FLOAT GLASS :
Online Coated Float Glass is also a basic clear or body tined float glass which has been coated with a thin inorganic material in the high temperature, the treatment of the surface of a moving continuous ribbon of a basic glass at a stage during its manufacture before it is cut. These are discussed in more detail under the heading”Solar Control Glasses”.
Offline Coated Float Glass :
Offline Coating, a secondary process, is a metallic coating on glass by process in a vacuum atmosphere. Multiple coatings can be applied for better thermal performance in a variety of colour options. Offline Coated glasses are of two types :
1. Offline Coated – Temperable after Coating.
2. Offline Coated – Not Temperable after Coating.
Coating surface of the offline coated glass should be positioned on interior side of the building or within the air gap of insulation glass unit (IGU). Glass with Low-e properties (silver layer as functional layer) should always be used with coating positioned within the air gap of IGU as silver coatings are efficient but prone to oxidation if kept exposed to the atmosphere
PATTERNED, FIGURED OR ROLLED GLASS :
Patterned Glass is a decorative and translucent glass with figures or patterns on one or both surfaces of glass. In addition to diffusing light and obstructing visibility from the outside, the figures soften the interior lighting. It is manufactured by a method similar to float glass wherein the molten glass is passed through rollers instead of floating on a molten tin bath. These metallic rollers are engraved with some patterns or designs, which are cast into the formed glass and can be used in most applications
for lighting but no see through. This type of glass is usually more brittle or fragile and less convenient to clean.
WIRED GLASS :
Wired glass is a glass in which wire mesh has been incorporated during its production. There are two kinds of wired glass:
1. Wired float glass
2. Figured wired glass .
Wired float glass will have a transparent feel allowing light as well as visibilty. Figured wired glass is much inferior, will allow light but no see through or visibilty through.
EXTRA CLEAR GLASS :
Greenish appearance in clear glass is due to the presence of a small iron content in silica sand. This greenish appearance in float glass is eliminated in extra clear glass by using purer sand & further reducing the iron content in silica sand. The typical iron content for normal float clear glass is 830-850 ppm, whereas the extra clear has less than 150 ppm. This makes it very clear in vision with high colour rendering index.
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