UQG Optics Ltd > Materials > Schott Robax Glass Ceramic

ROBAX® is an extremely heat-resistant, transparent glass ceramic which can be produced in a wide variety of shapes and sizes to meet your specific needs. We thus offer you all the advantages of a true temperature miracle: thanks to its extremely low thermal expansion, ROBAX® glass ceramic is not affected by extremely high temperatures (up to 760 °C) or substantial temperature shifts and differences. In addition, ROBAX® is highly permeable to thermal radiation, especially in the shortwave infrared range. This is the area with the largest and most intense amount of thermal expansion during combustion (for example in stoves) which we perceive as pleasant warmth. As a result, the glass ceramic can be used everywhere that very high thermal strength is required in combination with good transparency.

MECHANICAL PROPERTIES

Density	p Approx 2.6g/cm³ (25ºC)
Modulus of elasticity/Young’s modulus	E Approx 93 x 10³ Mpa (25ºC)
Poissons ratio	μ Approx 0.25
Bending strength	Approx 35 MPa

THERMAL PROPERTIES

Coefficient of mean linear thermal expansion	(0 ± 0.5) X 10-6/k
Specific heat	Approx 0.8 x 10³ J/(kg x K)
Thermal conductivity	Approx 1.6 W/ (m x k)

CHEMICAL PROPERTIES

Chemical Resistance DIN12116	At least class S3
Alkaline Resistance based on ISO 695	At least class A2
Hydrolytic Class DIN ISO 719	Class HGB 1

OPTICAL PROPERTIES

Transmission 3mm thick

Transmission 3mm in UV range

WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.