Product Overview

Description

Introduction:
A particularly low coefficient of thermal expansion is what makes BOROFLOAT^® glass remarkably resistant to high temperature levels. Our borosilicate glass is proven to stand up to high and fluctuating temperatures typical of applications such as high-performance lamps, cinema projectors and inspection panels for chemical reactors. Even with applications where rapid cooling down from higher temperatures is the requirement, BOROFLOAT^® glass easily passes the test. For example, the temperature difference between a hot panel center and a cold panel edge.

 

Outstanding thermal resistance

· Very good temperature stability

· Excellent resistance to thermal shock

· Can be thermally toughened

· Can be thermally shaped (3D)

Thermal properties
Coefficient of Linear Thermal Expansion (C.T.E.) α (20 - 300 °C)	3.25 x 10-6 K-1 *
Specific heat capacity cp (20 - 100 °C)	0.83 kJ/(kg·K)-1
Thermal conductivity λ (90 °C)	1.2 W/(m·K)-1
* According to ISO 7991.

 

Maximum operating temperatures
For short-term usage (< 10 h)	500 °C
For long-term usage (≥ 10 h)	450 °C

 

Viscosity of BOROFLOAT® 33
Working Point (104 dPas)	1270 °C
LITTLETON temperature / Softening Point (107,6dPas)	820 °C
Annealing Point (1013 dPas)	560 °C
Strain Point (1014,5 dPas)	518 °C
Transformation temperature (Tg)	525 °C