List of physical properties of glass


This is a list of some physical properties of common glasses. Unless otherwise stated, the technical glass compositions and many experimentally determined properties are taken from one large study. Unless stated otherwise, the properties of fused silica and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors.
The list is not exhaustive.
PropertiesSoda-lime glass Borosilicate Glass wool Special optical glass Fused silicaGermania glassGermanium selenide glass
Chemical
composition,
wt%		74 SiO2, 13 Na2O, 10.5 CaO, 1.3 Al2O3, 0.3 K2O, 0.2 SO3, 0.2 MgO, 0.01 TiO2, 0.04 Fe2O381 SiO2, 12.5 B2O3, 4 Na2O, 2.2 Al2O3, 0.02 CaO, 0.06 K2O63 SiO2, 16 Na2O, 8 CaO, 3.3 B2O3, 5 Al2O3, 3.5 MgO, 0.8 K2O, 0.3 Fe2O3, 0.2 SO341.2 SiO2, 34.1 PbO, 12.4 BaO, 6.3 ZnO, 3.0 K2O, 2.5 CaO, 0.35 Sb2O3, 0.2 As2O3SiO2GeO2GeSe2
Viscosity
log = A +
B / 		550–1450 °C:
A = -2.309
B = 3922
To = 291		550–1450 °C:
A = -2.834
B = 6668
To = 108		550–1400 °C:
A = -2.323
B = 3232
To = 318		500–690 °C:
A = -35.59
B = 60930
To = -741		1140–2320 °C:
A = -7.766
B = 27913
To = -271.7		515–1540 °C:
A = -11.044
B = 30979
To = −837		-
Glass transition
temperature, Tg, °C		573536551~5401140526 ± 27395
Coefficient of
thermal expansion,
ppm/K, ~100–300 °C		93.51070.557.3
Density
at 20 °C, [g/cm3], x1000 to get [kg/m3]		2.522.2352.5503.862.2033.654.16
Refractive index nD at 20 °C1.5181.4731.5311.6501.4591.6081.7
Dispersion at 20 °C,
104×		86.772.389.516967.8145
Young's modulus
at 20 °C, GPa		726575677243.3
Shear modulus
at 20 °C, GPa		29.828.226.831.3
Liquidus
temperature, °C		1040107017151115
Heat
capacity at 20 °C,
J/		495050514452
Surface tension,
at ~1300 °C, mJ/m2		315370290
Chemical durability,
Hydrolytic class,
after ISO 719		313