SCHOTT Supremax® Rolled Borosilicate
SCHOTT Supremax® Rolled Borosilicate is almost identical in its properties to Borofloat® 33, it has slightly lower surface quality due to the rolled process. It is a versatile borosilicate glass with excellent thermal properties, chemical resistance, and good light transmission material for its thickness. Supremax® Rolled Borosilicate also maintains a low density and therefore higher transmissivity compared to that of soda lime glass.
Features
- Large thickness range
- Very good optical properties
- Low thermal expansion
- High chemical durability
- Low density
Applications
- High temperature windows for lighting
- Optical windows, filters, and mirrors
- Chemically resistant view ports
- Bulletproof glass systems
Dimensions
Thicknesses
28.6mm – 66.7mm (1 ⅛" – 2 ⅝")
Sizes
Up to 90" x 67"
Mechanical Properties
Density (25°C) Ρ
2.2 g/cm3
137.3 lb/ft3
Young’s Modulus Ε
64 kN/mm2
9.28 Mpsi
Poisson’s Ratio μ
0.2
Knoop Hardness HK0.1/20
480
Bending strength σ
25 MPa
3.63 x 103 psi
Viscosity
Working Point (104 poises)
1270 °C
2318 °F
Softening Point (107.6 poises)
820 °C
1508 °F
Annealing Point (1013 poises)
560 °C
1040 °F
Strain Point (1014.5 poises)
518 °C
964 °F
Thermal Expansion
0 – 300°C (32 – 572°F)
3.25 x 10-6/K
Electrical Properties
Log10 Volume Resistivity
(250°C, 482°F)
8.0
Log10 Volume Resistivity
(350°C, 932°F)
6.5
Optical Properties
Index of Refraction @
435.8nm
1.4802
Index of Refraction @
479.9nm
1.4768
Index of Refraction @
546.1nm
1.4731
Index of Refraction @
589.3nm
1.4713
Index of Refraction @
643.8nm
1.4695
Index of Refraction @
656.3nm
1.4692
SCHOTT Supremax® Spectral Transmittance
