Tempered glass

Glass with fully tempered surfaces is typically four times stronger than annealed glass and two times as strong as heat-strengthened glass of the same thickness, size, and type. If fully tempered glass is broken, it will break into fairly small pieces, reducing the chance of injury.

What is Tempered Glass

Safety Glass

Heat-treated glass is heated in an oven at a high temperature and then cooled rapidly by blowing air onto both surfaces. The cooling process locks the glass surfaces in a state of compression while the core compensates for tension. The compression of the tempered glass surface is greater than 10,000 psi (68.9 MPa), therefore meeting standards such as ASTM C1048, ANSI Z97.1, AS/NZ 2208, EN12150, etc.

Tempered Glass

Why Choose AJJ

The Power of Quality

Highest Quality Tempering Furnaces

AJJ employs a fleet of world-class tempering furnaces across the enterprise. Our tempering furnaces give us the ability to produce high-quality heat-treated glass products consistently.

Oversize Capabilities

Our facilities and processes are carefully designed to handle the production of oversized heat-treated glass without compromising quality or durability.

Flatter Glass

Optical distortion is an inherent feature associated with heat-treated glass. Through AJJ’s commercial glass facilities, optical distortion is more effectively monitored and controlled. With cutting-edge optical distortion measurement equipment being used as a critical part of our quality control inspection process, AJJ can consistently put out optically flatter glass.

Fast Glass

We have multiple shifts working around the clock to meet your schedule and your project needs. Ask your sales representative about our expedited lead times for monolithic heat-treated glass products.

Key Features of Heat-treated Glass

Key Product Features

Meets Building Code Requirements

Using tempered glass can reduce the probability of serious injury in areas where human impact is probable. It can be used in applications where safety glazing is required by code, and it is widely used in shower doors, building entrances, glass railings and balustrades, vision and spandrel areas, and skylights.

Improved Resistance Against Thermal Stress

Using heat-strengthened and tempered glass on your project gives you a building product that is more resilient against exposure to temperature extremes and differential shading conditions.

Improved Resistance Against Shock

Where greater impact resistance is necessary, consider using heat-strengthened glass products. For any commercial glazing application, AJJ recommends the use of heat-treated glass.

Improved Resistance to Loads

The heat-treating glass increases its resistance to wind and snow loads. This improved performance can be critical when glass is used in structurally-glazed applications.

Tempered Glass Technical Specifications

Applications, Production Capacity & Considerations


Railings, glass doors and partitions, shower doors and enclosures.


  • Insulated glass units and spandrel glass
  • Skylights, storefronts


  • 4mm to 19mm  - Toughened 
  • 4mm to 12mm Heat Strengthened
  • 9.52mm to 39.52mm - Toughened/Laminate 

  • Minimum Size: 300 x 300mm
  • Maximum Size: 3660 x 18000mm

America Standards:

  • ANSI Z97.1 – Safety glazing materials used in buildings. This standard provides guidelines for safety glazing materials in residential and commercial applications, including tempered glass. It specifies the performance criteria for impact resistance and requires glass to meet certain fragmentation requirements.
  • ASTM C1036 – Flat Glass.
  • ASTM – C1048 – Heat-treated flat glass. This standard sets the minimum requirements for tempered flat glass. It covers glass thickness, surface compression, and fragmentation characteristics.
  • CAN/CGSB 12.1 – Safety or laminated glass,
  • CPSC 16 CFR- 1201 – The Consumer Product Safety Commission (CPSC) standard in the United States sets the requirements for architectural glazing materials, including tempered glass. It tests the glass for impact resistance and establishes different categories based on the glass thickness and the drop height required to break it.

Australian Standards:

Architectural – 4mm to 12mm Grade ‘A’ safety glass manufactured to AS/NZS 2208-1996 Safety glazing materials in buildings and 15mm to 19mm Toughened glass.

The Australian/New Zealand standard for safety glazing materials assesses the impact resistance of tempered glass. It classifies glass based on the drop height required to break it and provides guidelines for its use in different applications.

British & European Standards

  • BS 6206 - ' Code of practice for glazing for buildings'. Part 4: 1994 'Safety related to human impact'
  • BS EN 12600:2002 - Glass in building. Thermally toughened soda lime silicate safety glass.
  • EN 12150:2015 - This European Standard specifies tolerances, flatness, edgework, fragmentation, and physical and mechanical characteristics of monolithic flat thermally toughened glass.

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