THE SGI FACTORY
SG Industries comprise of a large factory with European made machinery of latest technology and experienced staff.
GLASS TEMPERING PROCESS
Tempered glass is 5 to 6 times thicker than normal annealed glass of an equivalent level. Thermally heat treated tempered glass has the strength to support comprehensive stress of 11000 to 20000 psi. It also has the potency to withstand sudden temperature changes and disparity up to 250 degrees Celsius. The inherent strength of tempered glass can withstand sudden impact. It has a unique fracture pattern when impact breakage takes place; the glass is broken into small fragments called dicing with no jagged edges or sharp shards, thereby substantially reducing injury.
Tempering does not alter the light transmission or solar heat properties of tempered glass. Tempered glass cannot be cut, drilled or chamfered after tempering. This type of glass is recommended for entrances to public buildings and areas that are mostly used by the general public where there may be risks of human impact. And also in areas that are exposed to wind, snow, high heat and thermal loading which exceeds the strength of normal glass.
Tempered glass are mostly used for railings, partitions and knockout windows, (tempered glass although empowered with normal resistance does not qualify for fire rated windows) Glass balustrades and handrails. Also for sky light and solar panels, escalator, stair case side panels, bathroom shower screens, bathtub enclosures, weight bearing shelving, sliding doors, swing doors, patio door assemblies and partitions, squash and racket ball court walls, showcases and display cabinets, hot and cold cupboard glass, refrigerators and oven doors, furniture and fireplace screens. Any field alterations such as sand blasting, edge grinding or acid etching can cause premature failure on tempered glass.
Tempered glass is prepared in accordance with final drawings and pre-determined sizes. In comparison with annealed or heat strengthened glass, Tempered glass has more tendency to spontaneous breakage caused by sudden powerful impact, weld splatter, windblown debris or internal inclusions during the manufacturing process originating from impurities which cannot be totally eliminated during processing, although it is strictly controlled.
Careless handling and improper installation sometimes may cause edge damage. Delayed breakdown may occur when edge damaged glass is subjected to moderate thermal or mechanical stress. Full penetration of the compression layer is likely to cause spontaneous fragmentation.
Stain patterns or iridescence are characteristics of tempered glass. The air quench nozzle discharges air in fixed motion for rapid cooling which may cause arrays of iridescence spots or lines on glass. These spots may be visible under lighting conditions or at sharp angles. This is an inherent trait and not a defect.