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China Suppliers Factory for Tempered Glass and Heat Strengthened Glass - Glaspedia Quality Safety Solutions
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China Suppliers Factory for Tempered Glass and Heat Strengthened Glass - Glaspedia Quality Safety Solutions

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Glaspedia Tempered Glass, recognized as toughened glass, is a high-performance safety glass extensively utilized in architecture, automotive sectors, and consumer products. Manufactured in China by top suppliers, its exceptional properties are achieved through advanced processing techniques that significantly enhance its strength and safety features while imparting unique optical qualities.

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Glaspedia Heat Strengthened Glass is a semi-toughened glass option frequently employed in architectural designs and specialized applications that demand moderate strength and predictable breakage behavior. As one of the leading products from our factory, it strikes a perfect balance between durability and optical clarity, making it an ideal choice for façades, laminated assemblies, and areas where tempered glass might not be the best fit.

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Product Details

Physics and Technology

Tempered Glass

Tempered glass is produced by heating annealed float glass to around 620–650°C and then rapidly cooling it with high-pressure air. This cooling process is also known as quenching. This process creates compressive stress on the surface and tensile stress in the core, making the glass four to five times stronger than ordinary annealed glass. When fractured, it breaks into small, blunt fragments rather than sharp shards, reducing injury risk.

Heat Strengthened Glass

Heat strengthened glass is produced by heating annealed float glass to approximately 620–650°C, similar to the tempering process, but then cooled at a slower rate. This creates surface compressive stress lower than tempered but higher than annealed glass, making it about twice as strong as ordinary annealed glass. It has less optical distortion and breaks into larger fragments, advantageous in laminated applications.

International Standards

To ensure safety and reliability, Glaspedia tempered and heat strengthened glass comply with most global standards.

  • US
    ASTM C1048 (United States)

    Defines mechanical strength and fragmentation requirements for tempered and heat strengthened glass.

  • EU
    EN 12150 (Europe)

    Specifies performance criteria for thermally toughened soda-lime silicate safety glass.

  • EU
    EN 1683 (Europe)

    Specifies performance criteria for heat strengthened glass.

  • AU
    AS/NZS 2208 (Australia & New Zealand)

    Governs tempered and heat strengthened glass under safety glazing materials.

  • INT
    IEC Standards (International)

    Govern tempered glass use in Building Integrated Photovoltaics (BIPV) applications.

Aesthetics

The tempering or heat treating process can introduce optical effects that influence design. Roller wave, bow, or warp may cause reflections to appear uneven, particularly on large façades. Anisotropy, visible as rainbow-like patterns under polarized light, results from stress distribution within the glass. While not defects, these phenomena affect visual uniformity.

South Star mitigates distortion and anisotropy through advanced inspection systems, Osprey 10 Complete by LiteSentry®, and optimized cooling processes, ensuring heat treated glass meets both functional and aesthetic expectations.

Glaspedia tempered and heat strengthened glass exemplifies the balance between physics, safety, and design. Its strength and compliance with international standards make it indispensable, while careful management of optical effects ensures it remains a material of choice for modern architecture and technology.

Frequently Asked Questions
Q What is the main difference between tempered glass and heat strengthened glass?
Tempered glass is cooled rapidly after heating, creating higher surface compressive stress that makes it four to five times stronger than annealed glass. Heat strengthened glass is cooled more slowly, resulting in lower stress levels and approximately twice the strength of annealed glass. Tempered glass breaks into small blunt fragments, while heat strengthened glass breaks into larger pieces, making it preferred for laminated applications.
Q Why does tempered glass break into small fragments instead of sharp shards?
During the tempering process, rapid cooling creates a high state of internal stress — compressive stress on the surface and tensile stress in the core. When the glass fractures, this stored energy is released all at once, causing the glass to break into small, blunt, pebble-like fragments rather than dangerous sharp shards, significantly reducing the risk of injury.
Q What international standards does Glaspedia tempered and heat strengthened glass comply with?
Glaspedia glass complies with a wide range of global standards including ASTM C1048 (United States), EN 12150 and EN 1683 (Europe), AS/NZS 2208 (Australia & New Zealand), and IEC Standards for BIPV (Building Integrated Photovoltaics) applications internationally, ensuring safety and reliability across different markets.
Q What is anisotropy in tempered glass and is it a defect?
Anisotropy refers to rainbow-like or iridescent patterns that become visible in tempered or heat strengthened glass when viewed under polarized light. It is caused by the uneven internal stress distribution created during the heating and cooling process. Anisotropy is not considered a defect — it is a natural characteristic of thermally processed glass — but it can affect the visual uniformity of glazed façades.
Q How does South Star reduce optical distortion in heat treated glass?
South Star uses advanced inspection systems, including the Osprey 10 Complete by LiteSentry®, combined with optimized cooling processes during production. These technologies help detect and minimize roller wave, bow, warp, and anisotropy, ensuring that the heat treated glass meets high standards for both functional performance and visual aesthetics.
Q Is heat strengthened glass suitable for use in laminated glass applications?
Yes. Heat strengthened glass is particularly well-suited for laminated glass applications. Because it breaks into larger fragments compared to tempered glass, the pieces tend to remain bonded to the interlayer material after breakage, providing better fragment retention. This makes laminated heat strengthened glass an excellent choice for overhead glazing, skylights, and applications where post-breakage integrity is important.