SWAS heat-strengthened glass is approximately twice as strong as annealed glass of similar thickness and configuration. Swas Heat-strengthened glass generally fractures in a manner similar to annealed glass and tends to remain in the opening when broken. It is intended for general glazing where additional strength and/or resistance to mechanical and/or thermal stress are desired. Heat-strengthened glass is NOT a safety glazing product and therefore should not be used where safety glazing is required.

Due to its superior glass retention properties, heat-strengthened glass is the preferred heat-treated glass product for applications where additional strength is needed to meet mechanical loads (wind or snow) or thermal loads caused by certain tinted or coated glasses. SWAS Heat-Strengthened glass is widely used in laminated glass for additional strength, such as in overhead and sloped glazing. Heat-Strengthened glass cannot be used in any safety glazing applications.

Most architectural glass products can be heat-treated. Some patterned glass and decorative glass with a deep surface pattern may not be heat-treatable. Silk-Screened and ceramic spandrel glass are always either heat-strengthened or tempered as part of their fabrication process. When spandrel glass is incorporated into insulating glass units, both lites must be heat-treated. Heat-absorbing glasses, such as standard and high performance tints, reflective glasses and some Low-E glass, may require heat treatment to reduce the probability of thermal-stress breakage, especially when used as part of an insulating glass unit.

The color, chemical composition and light transmission characteristics of glass remain unchanged after the heat-treating process. The physical properties of glass, such as the compressive strength, hardness, specific gravity, the softening point, thermal conductivity, solar transmittance, stiffness and expansion coefficient, also remain unchanged.

Glass is heat-treated by heating annealed glass to a temperature of approximately 1,150ºF (621°C), then rapidly cooling it. The glass is cooled by a carefully controlled airflow (also known as quenching), which uniformly cools all glass surfaces simultaneously. High airflow rates produce tempered glass and much lower airflow rates produce heat-strengthened glass.

• Twice Stronger than annealed glass
• SWAS Heat Strengthened Glass when breaks sticks to its frame
• The broken glasses' edges are not sharp as of annealed glass, thereby less dangerous

• Curtain Wall Glazing
• Windows
• Shopfronts
• Partitions

• Thickness : 4MM to 19MM
• Minimum size : 180MM x 350MM
• Maximum Size : 2440MM x 3660MM