High borosilicate glass

The specific physical and chemical properties of high borosilicate glass are as follows:

More than 80% silicon

Strain temperature 520 ℃

Annealing temperature 560 ℃

Softening temperature 820 ℃

Refractive index 1.47

Light transmittance (2mm) 92%

Modulus of elasticity 76knmm - 2

Tensile strength 40- 120nmm - 2

Glass stress optical constant 3.8 * 10-6 mm2 / no

Processing temperature (104dpas) 1220 ℃

Linear expansion coefficient (20-300 ℃) 3.3 * 10-6 K - 1

Density (20 ℃) 2.23gcm - 1

Specific heat 0.9jg - 1K - 1

Thermal conductivity 1.2wm - 1K - 1

Water resistance (ISO 719) class 1

Acid resistance (ISO 195) grade 1

Alkali resistance (ISO 695) grade 2