Brosilicate Glass Properties

  Metric US
Coefficient of mean linear thermal expansion α acc. to DIN ISO 7991 3.3 * 10-6 K-1
(20°C; 300°C)
3.3 * 10-6 K-1
(68°F; 572°F)
Transformation temperature Tg 525°C 977°F
Density ρ at 25°C 2.23g*cm-3 139.2 lb * ft-3
Modulus of elasticity E (Young's modulus) 63 * 103 N * mm-2 91*105 lb * in-2 (psi)
Poisson's ratio µ 0.20 0.20
Thermal conductivity λw at 90°C 1.2 W * m-1 * K-1 0.69 Btu * hr-1 * ft-1 * °F-1
Refractive index (λ = 587.6nm) nd 1.473 1.473
Stress-optical coefficient (DIN 52 314) K 4.0 * 10-6 mm2 * N-1 4.0 * 10-6 mm2 * N-1

See also