SCHOTT NEXTREMA®: Glass-ceramic for extreme conditions

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NEXTREMA® the high-performance glass-ceramic for functional designs 

Especially in high-temperature environments, where other materials such as plastic, conventional glass or metal show their limitations, NEXTREMA® glass-ceramics are an alternative. 

NEXTREMA® is available in six types, appearances, and different shapes. This makes it easy to find the right glass-ceramic that corresponds to your requirements as much as possible. It also gives you freedom of design and room for differentiation.

NEXTREMA® - a homogeneously coloured glass-ceramic material platform 

All six different types share the following key benefits: 

  • Service temperature up to 950°C (1742°F): NEXTREMA® glass-ceramic shows its real strength under conditions of extreme temperatures. Schott provides the right type of NEXTREMA® for the broadest range of temperatures – up to 950 °C (1,742 °F). 
  • Near zero thermal expansion: The intelligent microstructure of NEXTREMA® leads to a near-zero thermal expansion which allows the glass-ceramic to keep its shape at high temperatures.
  • Thermal shock resistance: With the excellent thermal shock resistance of NEXTREMA®, thermal material failure can be reduced.
  • Wide transmittance spectrum: Depending on the type and thickness of NEXTREMA®, there are different transmission ranges. These are essential for specific technical applications.
  • Surface resistance and gas impermeability: NEXTREMA® can be used even in different harsh environments. Due to its unique surface finish, NEXTREMA® has resistance to multiple acids and bases (DIN 12116, ISO 695, DIN ISO 719). 
  • Process inertness: Even under extreme conditions, NEXTREMA® will not have negative interactions with the process environment. The material is practically process inert. There are no interfering process factors such as gas emissions from organic components.
  • Robustness at high temperatures: NEXTREMA® keeps its strength even under heat: Also comparatively large but thin formats provide exceptionally high mechanical stability at high temperatures.

The NEXTREMA® product range 

schott-nextrema-material-types.jpg

Image courtesy of Schott © SCHOTT AG

 

NEXTREMA® transparent (724-3):

  • Highest thermal shock resistance of the different NEXTREMA® types
  • High transmission in the short wave infrared (IR) range
  • Excellent transparency

NEXTREMA® translucent white (724-5):

  • Broadest overall IR transmission window of all NEXTREMA® types below 2,800 nm
  • Combination of visible light reduction with high transmission in the infrared (IR) range
  • Highest level of chemical resistance against alkali solutions and acids (DIN 12116, ISO 695, DIN ISO 719)

NEXTREMA® opaque white (724-8):

  • Highest maximum temperature resistance of even up to 950 °C (1,742 °F)
  • Highest level of chemical resistance against alkali solutions and acids (DIN 12116, ISO 695, DIN ISO 719)
  • Visible light diffusing properties

NEXTREMA® tinted (712-3):

  • Highest bending strength of all NEXTREMA® types (of up to 165 MPa)
  • Combination of visible light reduction with high transmission in the infrared (IR) range
  • Thermal shock resistance of even up to 800 °C (1,472 °F)

NEXTREMA® translucent bluegrey (712-6):

  • Highest maximum temperature resistance of even up to 950 °C (1,742 °F)
  • Combination of visible light reduction with high transmission in the infrared (IR) range
  • Unique translucent design

NEXTREMA® opaque grey (712-8):

  • Highest maximum temperature resistance of even up to 950 °C (1,742 °F)
  • Highest thermal insulation properties of all NEXTREMA® types due to lowest overall transmission in the infrared (IR) range

Thermal characteristics of the NEXTREMA® product range

Coefficient of linear thermal expansion (DIN ISO 7991, DIN ISO 51045-1) 

In certain applications, the linear coefficient of thermal expansion and, therefore, the total change of length of a NEXTREMA® part within a specified temperature range is important to its function.

The following graph and table illustrate the temperature dependency of the thermal expansion of selected NEXTREMA® types (mean values; selected types). schott-nextrema-thermal-expansion.png

Image courtesy of Schott © SCHOTT AG

 

CTE (α) 

10-6 K-1

-50°C; 100°C

-0.8 – 0.6

0°C; 50°C

-0.8 – 0.6

20°C; 300°C

-0.4 – 0.9

300°C; 700°C

0.1 – 1.6


Maximum Temperature Gradient (MTG) 

The resistance of the material to temperature differences between a defined hot zone and cold edge of room temperature, without thermal stress induced cracking. NEXTREMA® offers a MTG of 400 - 800 K.

Thermal shock resistance (TSR)

The resistance of the material to thermal shock when the hot material is splashed with cold water at room temperature, without thermal stress induced cracking. NEXTREMA® offers a TSR of 600 - 800 °C (1,112 - 1,508 °F).

Optical characteristics of the NEXTREMA® product range

NEXTREMA® offers six transmission profiles in the visible and infrared range depending on material type and material thickness. 

schott-nextrema-transmission.png

Image courtesy of Schott © SCHOTT AG

 

The above graph is based on data from individual measurements. Deviations may result from the manufacturing process. Typical transmission graph of different ceramization states with sample thickness of approximately 4 mm. 

Standard forms of delivery

Schott offers flat random sheets (without any edge treatment), flat cut-to-size panels and bent panels. Current status of availability by material and form of delivery on request. Not all combinations are available. Other forms of delivery are available upon your request.

 

Image courtesy of Schott © SCHOTT AG

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Article by SCHOTT AG

SCHOTT is a leading international technology group in the areas of specialty glass and glass-ceramics. The company has more than 130 years of outstanding development, materials and technology expertise and offers a broad portfolio of high-quality products and intelligent solutions. SCHOTT is an innovative enabler for many industries, including the home appliance, pharma, electronics, optics, life sciences, automotive and aviation industries. SCHOTT strives to play an important part of everyone’s life and is committed to innovation and sustainable success. The parent company, SCHOTT AG, has its headquarters in Mainz (Germany) and is solely owned by the Carl Zeiss Foundation. As a foundation company, SCHOTT assumes special responsibility for its employees, society and the environment. This is also what the SCHOTT NEXTREMA® brand stands for. With high-performance glass-ceramic, SCHOTT offers a portfolio of materials that opens completely new fields of application for engineers and designers with its exceptional technical properties. As a real multi-talent, NEXTREMA® demonstrates what makes glass-ceramic a ground-breaking and unique solution, particularly in high temperature environments.

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