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Glass-ceramic

Heat-resistant glass - glass ceramic

Technical glass ceramics - temperature-resistant up to 950°C.

Heat-resistant glass - also known as glass-ceramic - is designed to withstand high temperatures and thermal shocks without breaking. The glass’s ability to do so is primarily due to its low coefficient of thermal expansion (CTE) combined with a high glass transition temperature. As a result, heat-resistant glass is frequently used in applications and projects where high temperatures, temperature fluctuations, or thermal shocks are common - such as in cooking, grilling, laboratories, or industrial processes.

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Our application examples for heat-resistant glass

NEXTREMA® glass-ceramic by SCHOTT for extreme temperatures

SCHOTT’s NEXTREMA® glass-ceramic is a glass material designed for high operating temperatures. With this unique material, we bring to life product ideas where glass might not be the first thing that comes to mind. Thanks to its impressive thermal shock resistance and non-porous surface, this heat-resistant glass is ideal for use in gas and electric grills. For example, it can be used as a burner guard that provides an optimal view of the flames or as an easy-to-clean surface for grilling food.

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Everything you need for the perfect experience

Temperature-resistant up to 950°C - coefficient of thermal expansion close to zero. NEXTREMA® is a glass-ceramic that combines the advantages of specialty technical glass with the properties of high-temperature materials.

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Properties - from transparent to opaque

The most important characteristic of heat-resistant glass is its high thermal shock resistance and high melting and softening point, which can reach up to 1000 °C. The material composition of NEXTREMA® results in the formation of ceramic molecules within the glass during the manufacturing process. This gives NEXTREMA® physical, chemical, and mechanical properties that provide engineers and designers with solutions for challenges where other materials have previously been unsuitable or only partially effective.

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We develop products and solutions to meet your exact requirements.

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Experience our 360° service using the example of the HMI demonstrator developed in-house.

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A material with virtually no expansion.

Thanks to its unique properties, this specialty glass is suitable for numerous industrial and household applications that require both high heat resistance and transparency. In addition, glass-ceramics are characterized by excellent resistance to acids and alkalis, which is why they are frequently used in laboratories. Among the best-known types of heat-resistant glass are borosilicate glass and quartz glass.

The Manufacture and Composition of Glass-Ceramics:

Technically speaking, glass-ceramics are no longer considered ordinary glass.
They are made from glass but are then selectively partially crystallized. This results in a material that lies between glass and ceramics. Glass-ceramics are produced through a distinctive manufacturing process and exhibit unique properties. They combine the best aspects of glass and ceramics, bringing them together to form a new class of materials. The coefficient of thermal expansion (CTE) of lithium-aluminum-silicate glass-ceramic (LAS) can be adjusted to nearly zero. A characteristic feature of glass-ceramics is their high glass transition temperature - that is, the characteristic temperature range in which amorphous or partially crystalline materials (such as plastics or glasses) transition from a hard, brittle state to a soft, rubbery to viscous state.

Properties:

  • extremely low thermal expansion
  • withstands very extreme temperature changes
  • more heat-resistant than, for example, borosilicate glass

Typical applications:

  • cooktops
  • glass panels for fireplaces
  • window and protective glass for industrial furnaces
  • high-end-laboratory equipment
  • telescopes

Applications in residential and industrial settings

A key feature of SCHOTT NEXTREMA® is its transmission in the IR spectrum, making it ideal for protecting infrared heating devices in both residential and industrial settings. For example, in residential settings, NEXTREMA® lends a patio heater an elegant design, while industrial dryers and soldering machines can benefit from this material’s durability in demanding environments.

The durable glass-ceramic from SCHOTT impresses not only with its resistance to thermal shock, but also with its surface durability and gas-tightness. A window or lid made of transparent NEXTREMA® glass-ceramic allows users to see what’s happening inside the grill without having to open the lid and disrupt the internal temperatures. It also lends the grill a sophisticated look and serves as a design element.

The durability and resistance of this type of glass to all kinds of environmental influences open up new application possibilities for engineers and designers.

NEXTREMA® glass-ceramic is available in six different variants, each with unique properties. NEXTREMA® was developed for extreme conditions and offers developers a platform for innovative functions and designs.

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1. NEXTREMA® transparent

Temperature-shock-resistant, infrared-transparent, and clear: This versatile glass material offers tremendous potential across all industrial sectors and is the material of choice when safety is a priority, processes need to be monitored, or internal components need to be made visible - especially in applications with high temperature requirements and extreme temperature fluctuations.

2. NEXTREMA® translucent white

This translucent white version appeals to developers looking for translucent materials suitable for applications that require high strength and temperature resistance. For example, for specialized lighting solutions.

3. NEXTREMA® opaque white

In addition to its outstanding chemical resistance to acids and alkalis in accordance with DIN 12116, ISO 695, and DIN ISO 719, this uniformly colored glass-ceramic withstands even the most demanding conditions and environments. This visually appealing and non-porous glass-ceramic is also used by designers and architects to add a sophisticated touch to a variety of projects.

4. NEXTREMA® tinted

Key features of this variant include excellent infrared radiation transmission and virtually zero thermal expansion. This makes it ideal for indoor and outdoor heating applications in both residential and industrial settings.

5. NEXTREMA® translucent bluegrey

The material features an impressive “dead-front” lighting effect. This means that, when viewed from above, no components installed beneath it are visible, yet light shines through from below. With its attractive color, the translucent blue-gray glass-ceramic can serve as a visual highlight in industrial and product design.

6. NEXTREMA® opaque grey

This material variant can serve as a decorative element in product design and is also highly heat-resistant. This makes it ideal for use in all areas of industrial production, such as display manufacturing, heating appliances, and microwaves.