B270 - Superwite
Special Properties
- High consistent visible transmission
- Very clear colorless appearance
- High purity glass composition
Typical Applications
- Laboratory and Coating Substrates
- LCD Covers
- Image Forming Optics
- Chip Masks
- Optical Windows
- Mirror coating substrates
B270-Superwite is an universal, economically priced 
quality glass, with a high transparency for visible and near infrared light. The crown glass from Schott has a colorless, white appearance and is particularly clear. B 270 is available as drawn, fire-polished sheet glass or as unpolished bar raw glass. The B270 sheet material is available at many different standard thicknesses and can be used without further surface treatment if surface quality is uncritical. To meet more demanding optical surface quality requirements, B270 can be mechanically ground and optically polished. This facilitates B270 to be used for sophisticated optical quality applications, while keeping the cost under control.
Specifications of B 270-Superwite*
Show transmission curve of B270
Refractive Index
- nd = 1,5230 (588nm)
Density
- 2,55 g/cm3
Young's Modulus
- E = 71,5 kN/mm2
Coefficient of Thermal Expansion (20-300°C)
- 95 x 10-7/K
Chemical Properties
- Hydrolytical Resistance (DIN12111), Class 3
- Alkali Resistance (DIN52322), Class 2
- Acid Resistance (DIN12116), Class 2
Electrical Properties
- Dielectr. Constant Er = 7 / Loss factor tan d = 30 x 10-4
B270 Standard Thicknesses |
|||
|---|---|---|---|
Tk. |
Tol. |
Tk. |
Tol. |
| 0,90mm | ±0,10 | 4,00mm | ±0,20 |
| 1,15mm | ±0,15 | 5,00mm | ±0,20 |
| 1,65mm | ±0,15 | 6,00mm | ±0,30 |
| 2,00mm | ±0,20 | 8,00mm | ±0,30 |
| 3,00mm | ±0,20 | 10,00mm | ±0,40 |
*Please consider the "Notes on technical specifications"
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