SCHOTT B 270®

Clear crown glass

Description

SCHOTT B 270® is a clear crown glass with high visible transmission and good optical quality for windows, filters, mirrors and other fabricated optical components.

Attribute	Value
Process	Precision cutting; edging; CNC fabrication; polishing; optical coating; screen printing
Features	High visible transmission; clear crown glass; good optical quality; suitable for coating
Substrate(s)	Clear crown glass
Color	Clear
Transmission Range (nm)	350 - 2700 nm
Refractive Index	1.5341
Sheet Length - Max (mm)	1676.4mm
Sheet Width - Max (mm)	711.2mm
Knoop's Hardness kg/mm²	500
Softening Point °C	711°C
Annealing Point °C	535°C
Strain Point °C	507°C
Transformation Temperature (Tg) °C	542
CTE (Coefficient of thermal expansion) α in 10-6 · K-1 (20°C; 300°C)	9.4
Specific Heat Capacity (Cₚ) kJ/(kg·K) (20–100°C)	1676.4
Thermal Conductivity (ʎ) W/(m·K) (90°C)	1
Photoelastic Constant (nm/cm/MPA)	27.5
Can be strengthened?	Yes

Advantages

economical optical glass
fabricatable
good optical quality
High visible transmission

Applications

cover glass
filters
imaging systems
mirrors
Optical windows

Industries

Imaging & Sensing
Industrial
Medical & Biomedical
Photonics & Electro-Optics