SCHOTT BOROFLOAT® 33
Description
SCHOTT BOROFLOAT® 33 is a borosilicate float glass with excellent thermal resistance, low thermal expansion, chemical durability and good optical transmission for demanding technical glass applications.
Attribute | Value |
|---|---|
Process | Precision cutting; CNC fabrication; edging; drilling; screen printing; optical coating; heat strengthening where applicable |
Features | Low thermal expansion; high temperature resistance; chemical durability; good transmission; low density |
Substrate(s) | |
Color | |
Transmission Range (nm) | 400 - 2700 nm |
Refractive Index | 1.471 |
Sheet Length - Max (mm) | 2300mm |
Sheet Width - Max (mm) | 1700mm |
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 | 525 |
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) | 2300 |
Thermal Conductivity (ʎ) W/(m·K) (90°C) | 1.25 |
Photoelastic Constant (nm/cm/MPA) | 40 |
Can be strengthened? | Yes |
Advantages
- good optical transmission
- heat resistance
- high chemical resistance
- low density
- Low thermal expansion
Applications
- filters
- lighting windows
- medical and analytical devices
- mirrors
- Optical windows
- viewports
Industries
- Defense & Avionics
- Industrial
- Lighting
- Medical & Biomedical
- Photonics & Electro-Optics