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Borofloat Optical Glass

Borofloat Optical Properties
Thermal Properties
Thermal Coefficient of Expansion (0/300°C): 32.5 X 10 -7/°C
Annealing Point 560°C / 1040°F
Softening Point 815°C / 1508°F

Mechanical Properties
Density 2.23 g/cm3 (at 25 °C / 77 °F)
Knoop Hardness HK0.1/20:480
Young's Modulus N/A
Poisson's Ratio 0.20

Optical Properties
Refractive Index 1.472

Chemical Properties
Hydrolytic Resistance class1
Acid Resistance class 1
Alkali Resistance class 2

Electrical Properties
Dielectric Constant E=4.6 @/MHz & 25°C
Resistivity 8.0 X 250°C; 6.5 @ 350°C
Dielectric Strength 16 KV/mm @ 50 Hz & 25°C