The “Securit” tempering process was discovered in Saint-Gobain’s laboratories in 1929, in the course of research undertaken at the request of the automobile industry. The process, which consists of strengthening the glass by very fast blast cooling (from 600 to 300° C in a few seconds), is used to make automobile, building, and specialty flat glass. Tempered glass is also a safety glass. A violent impact shatters tempered glass into many tiny non-cutting fragments

Applications Generally, all windows except for the windshield. Type of glass Clear, tinted and deep tinted glass Standard thickness : 3, 4, 5mm Spectral data See table below for average values given for a thickness of 3.15mm. Tolerances depend on production and measurement methods.
TL/RL: Light transmission / reflection, type of light A, 2°, daylight viewing 380-780 nm
TE/RE: Energy transmission / reflection, Parry Moon, mass 2, 280-2500nm
TIR/RIR: Infrared transmission / reflection, Parry moon, mass 2, 780-2500nm
TUV: UV transmission, Schulze, ISO 9050, 280-380 nm
Physical and chemical properties:-
Density 2500 kg/m3
Hardness 470 HK
Modulus of elasticity 70 000 MPa
Bending strength after tempering 100-120 MN/m2
Specific heat 0.8 J/g/K
Thermal conductivity 0.8 W/mk
Temperature coefficient of expansion 9.10-6 K -1
The manufacturing process for tempered glass
Saint-Gobain Sekurit tempered glass is produced in the following stages:
Step1. Glass pre- processing:
Step2. Glass pre- processing:

Step3. Forming:

Automotive windows are usually made from laminated glass for windshields and tempered glass for sidelites and backlites. Laminated glazing can also be used for sidelites and backlites, mainly to improve safety and security.

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Also read :-

  2. Types of Glass & it’s Mechanical properties



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