Glass Type: Glass Ceramics


SCHOTT NEXTREMA® is a highly versatile glass-ceramic with excellent temperature and thermal shock resistance and near zero thermal expansion– even under demanding conditions and in challenging environments. NEXTREMA® exhibits high mechanical strength– without the need for additional toughening processes. It also offers six transmission profiles in the visible and infrared range.

NEXTREMA® can be used in a broad range of applications due to its differing material thicknesses between 2 mm and 6 mm (>6 mm on request). Some examples of areas where NEXTREMA® has been used successfully include grilling, infrared heaters, high temperature furnaces, and household appliances, among others.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion (-50 °C; 100 °C)-0.8 – 0.6 x 10-6 K-1Density≈2.6 g/cm3
Thermal Coefficient of Expansion (0 °C; 100 °C)-0.8 – 0.6 x 10-6 K-1Knoop Hardness HK 1.1/20≈585 Hk
Thermal Coefficient of Expansion (20 °C; 300°C)-0.4 – 0.9 x 10-6 K-1Young's ModulusN/A
Thermal Coefficient of Expansion (300 °C; 700 °C)0.1 – 1.6 x 10-6 K-1Poisson's Ratio≈0.26 µ
Chemical PropertiesElectrical Properties
Hydrolytic Resistance DIN ISO 719HGB 1Dielectric Constant εr at 1 MHz6.5 -7.8
Acid Resistance DIN 12116S 1-2Resistivity ρD DC at ϑ = 350°C in Ω·cm5.2-5.7
Alkali Resistance DIN ISO 695A 1-2Dielectric StrengthN/A
Optical Properties
Refractive IndexN/A