Heat Treated Glass

Heat treated glass is produced through a controlled process of heating to its softening point followed by rapid cooling, which increases surface compressive stress, improves mechanical strength, and enhances thermal stability. Based on the degree of cooling, heat treated glass can be classified into two types: tempered (or toughened) and heat-strengthened.

Tempered (toughened) glass is cooled rapidly, producing high surface compressive stress and mechanical strength approximately 4–5 times that of ordinary glass. It is recognized as a type of safety glass; when broken, the fragments form small blunt particles arranged in a honeycomb pattern, reducing the risk of injury. It is widely used in façades, windows, doors, interior partitions, furniture, and partitions located near heat sources or exposed to sudden temperature changes. Tempered glass can also be processed into curved glass, offering additional design possibilities for more complex architectural forms.

Heat-strengthened glass is cooled more slowly to achieve moderate surface compressive stress, which offers excellent thermal stability and superior flatness, with a lower spontaneous breakage rate; It is generally used in façade glass combined with laminated glass to achieve safety performance.

Depending on project requirements, tempered and heat-strengthened glass can be combined with insulating glass units (IGU) or laminated glass to provide tailored solutions for structural, safety, and thermal performance.