Glass Property Sheet

Corning Code: 7056
Glass Type: Alkali Borosilicate

MechanicalMetric      English      
Density2.29g/cm3143 lb/ft3
Young's Modulus6.4 x 103 kg/mm29.2 x 106 psi
Poisson's Ratio0.21 
Shear Modulus2.7 x 103 kg/mm23.8 x 106 psi
 
Viscosity
Working Point (104 poise)1058°C1936°F
Softening Point (107.6 poise)718°C1324°F
Annealing Point (1013 poise)512°C954°F
Strain Point (1014 poise)472°C882°F
 
Thermal
Coefficient of Expansion (0-300°C)51.5 x 10-7/°C28.5 x 10-7/°F
(25°C to set point 679°C)54.5 x 10-7/°C30.0 x 10-7/°F
 
Optical
Refractive Index (589.3 nm)1.487
Birefringence Constant300nm/cm/kg/mm2
 
Electrical
Log10 Volume Resistivity @250°C10.3 ohm-cm
                                            @350°C8.4 ohm-cm
Dielectric Constant @ 20°C, 1MHz5.7
Loss Tangent @20°C, 1MHz0.27%

For more information on our 7056 glass
please contact us at
7056@corning.com.

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