Hot Products

China Suppliers Tempered and Heat Strengthened Glass | Quality Factory Production for Architecture and Design

Glaspedia Tempered Glass, commonly referred to as toughened glass, is a premium safety glass that plays a crucial role in various sectors, including architecture, automotive industries, and consumer products. Manufactured in China by leading suppliers, this glass undergoes advanced processing techniques that significantly enhance its strength and safety. Its remarkable optical characteristics make it a preferred choice for modern designs and innovative applications.

Glaspedia Heat Strengthened Glass is a semi-toughened glass option, ideal for architectural projects and specialized applications requiring moderate strength and controlled breakage features. As a product from a renowned factory in China, this glass strikes a perfect balance between durability and clarity, making it suitable for facades, laminated assemblies, and various scenarios where traditional tempered glass may not meet the requirements. Choose Glaspedia for high-quality glass solutions that cater to your needs.

Products Categories

Product Details

Physics and Technology

Tempered Glass

Produced by heating annealed float glass to around 620–650°C and then rapidly cooling it with high-pressure air (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

Produced by heating annealed float glass to approximately 620–650°C, similar to tempering, but cooled at a slower rate. This creates lower surface compressive stress than tempered glass, yet 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 where fragment retention is desired.

The key difference between tempered and heat strengthened glass lies in the cooling rate after heating — faster cooling produces tempered glass with higher strength; slower cooling produces heat strengthened glass with better optical clarity.

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

Q What is the main difference between tempered glass and heat strengthened glass?

The primary difference lies in the cooling rate during production. Tempered glass is rapidly cooled (quenched), creating higher surface compressive stress and making it 4–5 times stronger than annealed glass. Heat strengthened glass is cooled more slowly, resulting in lower stress levels — about twice the strength of annealed glass — with better optical clarity and larger breakage fragments.

Q Why does tempered glass break into small pieces while heat strengthened glass breaks into larger fragments?

The higher internal stress in tempered glass causes it to shatter into small, blunt granular pieces when broken, which significantly reduces injury risk. Heat strengthened glass, with lower internal stress, breaks into larger fragments — a property that is particularly advantageous in laminated glass applications where fragment retention is important.

Q What is anisotropy in heat treated glass, and is it a defect?

Anisotropy refers to rainbow-like or iridescent patterns visible in tempered or heat strengthened glass when viewed under polarized light. It results from the internal stress distribution created during the thermal treatment process. It is not considered a defect, but it can affect the visual uniformity of glass in architectural applications, especially on large façades.

Q Which international standards does Glaspedia tempered and heat strengthened glass comply with?

Glaspedia products comply with major 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. This broad compliance ensures suitability for international architectural and construction projects.

Q When should heat strengthened glass be used instead of tempered glass?

Heat strengthened glass is preferred in laminated glass applications where fragment retention upon breakage is critical for safety and structural integrity — such as overhead glazing, skylights, and canopies. It is also preferred when lower optical distortion is required, such as in high-visibility architectural façades where visual clarity is a priority.

Q How does Glaspedia minimize optical distortion in heat treated glass?

Glaspedia (South Star) employs advanced inspection systems, including the Osprey 10 Complete by LiteSentry®, along with optimized cooling processes during production. These measures help control roller wave, bow, warp, and anisotropy, ensuring the final product meets both functional performance requirements and high aesthetic standards for modern architecture.