sejal architectural glass limited - Securities and Exchange Board of ...

) Tempering Process
The glasses are first cut to size as per customer requirements. Edge working, drilling, cut outs
and ceramic enameling are carried out on the glasses as required. The tempering machine has
two main sections – The furnace and the quench. The glasses to be tempered are heated first in
the furnace to a temperature of approx 650 deg celcius. The glass remains in the furnace till
the entire glass is uniformly heated. The glass then rapidly moves to the quench where the top
and the bottom surfaces of the glass are suddenly and uniformly cooled by air jets under
pressure. The pressure and volume of air flow is regulated automatically depending upon the
thickness and the type of tempering required on the glass.
Full toughening ensures glass breaks in the small fragments greatly minimizing chances of
injury to people and is therefore classified as a safety glass. Besides, the glass has higher
strength and thermal shock resistance compared to heat strengthened glass which is not a
safety glass.
The glass cools to near room temperature in the quench and then it is unloaded and moved to
the next process.
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