Heat-strengthened Laminated Glass

Heat Strengthened Laminated Glass is made by Heat Strengthened Glass+PVB interlayer Film +Heat Strengthened Glass . 

Semi-toughened, semi-tempered or heat-strengthened glass

Semi-toughened or heat-strengthened glass did have a thermal treatment similar to the thermal curing, but where the obtained voltage is lower than the one of toughened glass, because the cooling was slower.
Semi-toughened or heat-strengthened glass doesn't have the same characteristics compared to the commodities which it was made of: 

• Heat strengthened or semi-toughened glass can not be cut, sawn, drilled or modified after the thermal treatment, Any cutting or drilling of holes must happen before the treatment.

• The load impact is 2 to 3 times bigger compared with standard (float) glass.

• The flexural strength is 2 to 3 times bigger compared with standard (float) glass.

• Heat strengthened or semi-toughened glass has a better resistance to thermal shocks than annealed glass: it resists temperature differences of circa 100°C, while annealed glass breakage can occur with a temperature difference of circa 30°C. However, this value is highly variable and depends on the quality of the edge of the glass.

• Heat strengthened or semi-toughened glass has the same fragmentation as a standard (float) glass. Because this glass has a big risk of injury, heat-strengthened glass is not a safety glass

• Heat strengthened or semi-toughened glass has a better optical quality than toughened or tempered glass by reduction of the optical distortions which are inherent to the temperature and duration of the curing process.

• In case of glass breakage the shards (similar to those of annealed glass) can cause injury. That's why it is not considered a safety glass. The fracture image of semi-toughened glass can easily be recognized because of the star shape.

• The Heat Soak Test, which is applied to reduce the risk of spontaneous breakage due to nickel sulphide inclusions, is not necessary for heat strengthened or semi-toughened glass.

• Heat-strengthened or semi-toughened glass is particularly used to prevent a fracture as a result of large temperature differences in the glass element due to for exemple drop shadows.

• Heat-strengthened or semi-toughened glass is used in glass façades.