SCHOTT SUPREMAX®

Rolled borosilicate glass

Description

SCHOTT SUPREMAX® is a rolled borosilicate glass with properties similar to BOROFLOAT® 33 but available in thicker formats for robust thermal and optical applications.

Attribute	Value
Process	Precision cutting; grinding; polishing; CNC fabrication; optical coating
Features	Large thickness range; very good optical properties; low CTE; high chemical durability; low density
Substrate(s)	Rolled borosilicate glass
Color	Clear
Transmission Range (nm)	300 - 900 nm
Refractive Index	1.472
Sheet Length - Max (mm)	2286mm
Sheet Width - Max (mm)	1701.8mm
Knoop's Hardness kg/mm²	480
Softening Point °C	820°C
Annealing Point °C	560°C
Strain Point °C	518°C
Transformation Temperature (Tg) °C	530
CTE (Coefficient of thermal expansion) α in 10-6 · K-1 (20°C; 300°C)	3.25
Specific Heat Capacity (Cₚ) kJ/(kg·K) (20–100°C)	2286
Thermal Conductivity (ʎ) W/(m·K) (90°C)	1.2
Photoelastic Constant (nm/cm/MPA)	40
Can be strengthened?	Yes

Advantages

high chemical durability
Large thickness range
low density
Low thermal expansion
very good optical properties

Applications

ballistic laminates
chemical-resistant viewports
filters
High-temperature windows
mirrors
Optical windows

Industries

Defense & Avionics
Industrial
Lighting
Photonics & Electro-Optics