Opaque glass-ceramic with light-blocking properties: SCHOTT NEXTREMA® opaque grey (712-8)

The opaque grey material type is a top-quality glass-ceramic used in countless applications. It is the strongest heat-insulator out of all NEXTREMA® types. This is down to its low overall transmission in the IR spectrum. Opaque grey also boasts enormous heat resistance: it can withstand up to 950 °C. This light-blocking glass-ceramic is a high-quality material used in all areas of industrial production – in display manufacturing for example. It is also used in applications where the transmission of radiation in visible light and IR spectrum is to be kept to a minimum. Other key areas of application include for instance heating appliances and microwaves. This opaque glass-ceramic can also serve as a decorative element in product design.

Key properties
  • Opaque special material that blocks visible light
  • Strong heat-insulation properties due to low overall transmission in the IR spectrum
  • Opaque glass-ceramic with outstanding temperature resistance – up to 950 °C
  • Chemically resistant to acids, bases and corrosion-resistant special glass according to DIN 12116, ISO 695 and DIN ISO 719
    (for details see: chemical properties)

Example fields of application
  • Inner lining of high-temperature cleanroom furnaces (e.g. in display manufacturing)
  • Easy-clean cover plates for magnetrons in microwave ovens
  • Decorative cover plates for dark radiator heating systems

Standard forms of delivery

The current status of availability by material and form of delivery has to be requested by the customer. Not all combinations are producible. Other forms of delivery are available on request.

General appearance

Transparent, translucent white, translucent bluegrey, opaque white, opaque grey, tinted. One-sided nubs are available on request. The surface texture depends on the thickness. Decoration is available on request.


Flat cut-to-size panels

Thickness Standard length
Min. - Max.
Standard width
Min. - Max.
2 mm 50–1,915 mm 50–860 mm On request
3 mm 50–1,930 mm 50–1,075 mm C, U, V
4 mm 50–1,930 mm 50–1,075 mm C, U, V
5 mm 50–1,930 mm 50–1,075 mm C, U, V
6 mm 50–1,930 mm 50–1,060 mm C, U, V
≥ 8 mm 50–on request 50–960 mm C, U, V

Bent panels

Formats of bent panels on request. Various shapes are available.
Further data and information available on request. Please do not hesitate to contact us. We will gladly be of assistance.

SCHOTT NEXTREMA® applications – together we can create something revolutionary

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