Glass is a versatile material that has found its way into numerous applications across different industries. From architectural and interior design to automotive and electronic devices, glass is widely used due to its aesthetic appeal and durability. Heat-strengthened glass has unique properties and benefits among the different types of glass. In this blog, we’ll discuss what heat-strengthened glass is, how it’s manufactured, and where to use it.

What is Heat-Strengthened Glass?

Heat-strengthened glass is a toughened glass produced by heating it to a temperature just below its melting point and then cooling it. This process improves the glass’ strength and durability compared to float glass. However, although heat-strengthened glass is more robust than float glass, it is not as strong as fully tempered glass.

How is it Manufactured?

The manufacturing process of heat-strengthened glass involves heating it to a temperature of around 700°C. Once the glass reaches this temperature, it’s cooled to improve its strength and durability. Furthermore, the cooling process is carried out in such a way that the surface of the glass cools faster than its core, which helps to increase its resistance to thermal stress.

Annealed Glass vs Heat-strengthened Glass vs Fully Tempered Glass

What is the difference between heat-strengthened glass, annealed glass, and full-tempered glass in terms of fragmentation states?

Heat-strengthened and annealed glass have lower strength levels than full-tempered glass. Therefore, when heat-strengthened glass is impacted, it may crack into large fragments. Annealed glass is even more likely to shatter into long, dangerous shards when impacted. Full-tempered glass is the strongest of the three; when it is largely impacted, it will break into small, rounded fragments that are less likely to cause injury.

Why Heat-Strengthened Glass?

  • Improved Strength: The heat treatment improves the glass’s strength, making it less likely to break or shatter in case of impact.
  • Durability: It is more durable than standard float glass, making it an excellent choice for safety and security applications.
  • Aesthetic Appeal: The clear and transparent nature makes it a popular choice for architectural and interior design applications where aesthetics are essential.
  • Energy Efficiency: It has a high thermal resistance, which makes it a good choice for energy-efficient buildings.

When to use it instead of fully tempered glass?

Heat strengthened glass provides higher resistance to thermal stress than annealed glass but is not as strong as fully tempered glass. As a result, it is often used in applications where a higher level of thermal resistance is required, but the full strength of tempered glass is not necessary. This makes it a cost-effective alternative to fully tempered glass in certain situations, such as in some architectural glazing facades, skylights, and display cases. Additionally, it can be cut and drilled, unlike fully tempered glass, making it more versatile for certain types of installations.

glass building


Heat-strengthened glass is a versatile and cost-effective alternative to fully tempered glass. Its strength and durability, combined with its aesthetic appeal, make it a unique choice for various applications, from architectural and interior design to automotive and electronic devices.

Check out the Product Page of Heat Strengthened Glass for more specifications.