Heat-strengthened glass (HS) is also known as partially toughened or semi-tempered. Produced using annealed glass, it is heated to approximately 650°C. It is then quenched by jets of cooled air. This rapid cooling or quenching induces compression stresses on the glass surface while the centre remains in tension. Although the physical characteristics remain unchanged, the additional stresses created within the glass increase its thermal resistance and mechanical strength.
Heat-strengthened glass has a mechanical strength of approximately twice that of annealed glass and if broken, breaks into large pieces from edge to edge and does not fracture into small fragments like toughened glass.
Heat-strengthened glass is not prone to spontaneous breakage due to the nickel sulphide. This is because the process to produce heat-strengthened glass is similar to heat soaking, which reduces the incidence of failure due to nickel sulphide inclusions. HS is not a safety glass and cannot be used for human impact applications but can be used in almost all applications as laminated HS glass, especially for floors and Facades.
| FEATURE | DESCRIPTION |
|---|---|
| Process Type | TAMGLASS Horizontal Tempering Furnace – Pro E Magnum 2860 – CS – 20 With CGSB |
| Glass Types | Clear, extra clear, ultra clear, tinted, solar-control coated, low-E coated |
| Additional Process Compatibility | Ceramic-frit, digital printing, sand-blasting, acid etching |
| Product Enhancement | Can be converted to insulated glass and laminated glass |
| Unit Thickness Range | 4 mm to 10 mm |
| Edge Types | Rough grind, Edge arrised, Matt finished, Polished Edges |
| Emissivity | Minimum 0.01*** |
| Dimensions |
Minimum Size 200 mm x 300 mm Maximum Size 2440 mm x 3600 mm (4 mm and 5 mm) 2800 mm x 6000 mm (Clear Glasses) 2750 mm x 5500 mm (Coated Glasses) |
