Soda-lime Glass - Typical Compositions and Properties

Typical Compositions and Properties

The following table lists some physical properties of soda-lime glasses. Unless otherwise stated, the glass compositions and many experimentally determined properties are taken from one large study. Those values marked in italic font have been interpolated from similar glass compositions (see calculation of glass properties) due to the lack of experimental data.

Properties Soda-lime glass
for containers		 Soda-lime glass
for windows
Chemical
composition,
wt%		 74 SiO2, 13 Na2O,
10.5 CaO, 1.3 Al2O3,
0.3 K2O, 0.2 SO3,
0.2 MgO, 0.04 Fe2O3,
0.01 TiO2		 73 SiO2, 14 Na2O,
9 CaO, 4 MgO,
0.15 Al2O3, 0.03 K2O,
0.02 TiO2, 0.1 Fe2O3
Viscosity
log(η, dPa·s or Poise) = A +
B / (T in °C − To)		 550–1450°C:
A = −2.309
B = 3922
To = 291		 550–1450°C:
A = −2.585
B = 4215
To = 263
Glass transition
temperature, Tg, °C		 573 564
Coefficient of
thermal expansion,
ppm/K, ~100–300°C		 9 9.5
Density
at 20°C, g/cm3		 2.52 2.53
Refractive index
nD at 20°C		 1.518 1.520
Dispersion at 20°C,
104×(nF−nC)		 86.7 87.7
Young's modulus
at 20°C, GPa		 72 74
Shear modulus
at 20°C, GPa		 29.8 29.8
Liquidus
temperature, °C		 1040 1000
Heat
capacity at 20°C,
J/(mol·K)		 49 48
Surface tension,
at ~1300°C, mJ/m2		 315
Chemical durability,
Hydrolytic class,
after ISO 719		 3 3...4
Critical stress
intensity factor,
(KIC), MPa.m0.5		 ? 0.75
  • Coefficient of restitution (glass sphere vs. glass wall): 0.97 ± 0.01
  • Thermal conductivity: 0.9-1.3 W/m.K
  • Hardness (Mohs scale): 6
  • Knoop hardness: 585 kg/mm2 + 20

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