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Tempered Glass & Heat Strengthened Glass from China Suppliers | Quality Products from Leading Factory

Glaspedia Tempered Glass is a premium safety glass, commonly referred to as toughened glass, extensively utilized in various sectors including architecture, automotive, and consumer goods. This glass is manufactured using advanced processing techniques that enhance its strength and safety features, while also offering unique optical properties. As a reliable choice among China suppliers, Glaspedia is known for its commitment to quality and durability.

Glaspedia Heat Strengthened Glass is a semi-toughened variant designed specifically for architectural and specialty applications that demand balanced strength and controlled breakage. This type of glass provides an ideal combination of durability and optical clarity, making it perfect for facades, laminated assemblies, and situations where tempered glass might not be the best fit. As a leading factory in China, we ensure that our heat strengthened glass meets the highest standards for quality and performance.

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Physics and Technology

Tempered Glass 4–5× Stronger

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 ~2× Stronger

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 controlled cooling creates surface compressive stress that is lower than tempered glass but higher than annealed glass. As a result, heat strengthened glass is about twice as strong as ordinary annealed glass. It has less optical distortion due to lower stress level. When fractured, it breaks into larger fragments compared to tempered glass, which is advantageous in laminated applications where retention of fragments is desired.

International Standards

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

ASTM C1048 — United States
Defines mechanical strength and fragmentation requirements for tempered and heat strengthened glass.
EN 12150 — Europe
Specifies performance criteria for thermally toughened soda-lime silicate safety glass.
EN 1683 — Europe
Specifies performance criteria for heat strengthened glass.
AS/NZS 2208 — Australia & New Zealand
Governs tempered and heat strengthened glass under safety glazing materials.
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

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 4–5 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. When broken, tempered glass shatters into small blunt pieces, while heat strengthened glass breaks into larger fragments.

What temperature is used in the tempering or heat strengthening process?

Both processes begin by heating annealed float glass to approximately 620–650°C. The key difference lies in the subsequent cooling rate — tempered glass is quenched rapidly with high-pressure air, while heat strengthened glass is cooled at a controlled, slower rate.

Why is heat strengthened glass preferred in laminated glass applications?

When heat strengthened glass fractures, it breaks into larger fragments rather than tiny pieces. In laminated applications, these larger fragments tend to remain held together by the interlayer, providing better fragment retention and maintaining structural integrity — an important safety consideration in overhead or façade glazing.

What international standards does Glaspedia glass comply with?

Glaspedia tempered and heat strengthened glass complies with a wide range of global standards including ASTM C1048 (USA), EN 12150 and EN 1683 (Europe), AS/NZS 2208 (Australia & New Zealand), and relevant IEC Standards for Building Integrated Photovoltaics (BIPV) applications.

What causes anisotropy in tempered or heat strengthened glass?

Anisotropy appears as rainbow-like or iridescent patterns visible under polarized light. It is caused by the non-uniform distribution of internal stress created during the heating and cooling process. While it is not a defect, it can affect the visual uniformity of the glass, especially on large-scale façades.

How does Glaspedia manage optical distortion in heat treated glass?

South Star employs the Osprey 10 Complete inspection system by LiteSentry® along with optimized cooling processes to minimize roller wave, bow, warp, and anisotropy. This ensures that heat treated glass consistently meets both high functional performance standards and strict aesthetic requirements for modern architectural projects.