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
Detailed Images
Different Glass Wafer
Optical lens
Spotlight glass disc
Optical filter
Cover glass
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Sales manager:Spring Lin
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