B 270® is a universal, economically priced crown glass with high transparency in the visible and near-infrared range. The modified soda-lime glass from SCHOTT has a colorless, crystal-clear appearance. It is very resistant to the solarization effects that typically occur when a material is continuously exposed to the sun or UV light. When other glass materials change color, B 270® stays white and clear. B 270® is available as fire-polished sheet glass or unpolished raw glass ingots. B 270®, in the form of blank-drawn sheet glass, exists in a wide range of thicknesses. For sight glass applications where the quality of the surfaces and waviness are not critical, B 270® can be used without further treatment. If optical quality is required, B270® flat glass materials must be ground and optically polished. Due to its purity, such polished B 270® can be used to fabricate demanding optics that require a refractive index of around 1.52, while offering lower costs than many optical glasses.
To get a quote for glass parts made of SCHOTT B 270® crown glass with specific dimensions, please choose a thickness from the table in the specifications or click the button below.
Transmission spectrum
Transmission curve of B270®
UV-transmittance at 1.15 mm
UV-Transmission of B270®
Thickness (mm) |
Tolerance |
![]() |
---|---|---|
0.80 | ±0.10 | ✔ |
0.90 | ±0.10 | - |
1.00 | ±0.10 | ✔ |
1.10 | ±0.10 | ✔ |
1.15 | ±0.15 | ✔ |
1.20 | ±0.15 | ✔ |
1.35 | ±0.15 | ✔ |
1.50 | ±0.15 | ✔ |
1.65 | ±0.15 | ✔ |
1.85 | ±0.15 | ✔ |
2.00 | ±0.15 | ✔ |
2.50 | ±0.20 | ✔ |
3.00 | ±0.20 | ✔ |
3.50 | ±0.20 | ✔ |
4.00 | ±0.20 | ✔ |
4.50 | ±0.20 | ✔ |
5.00 | ±0.20 | ✔ |
6.00 | ±0.30 | ✔ |
8.00 | ±0.30 | - |
10.00 | ±0.40 | - |
Refractive Index (20 °C) |
||
---|---|---|
Description |
Wavelength (nm) |
Refractive Index |
ng |
436 |
1.5341 |
nF' |
480 |
1.5297 |
nF |
486 |
1.5292 |
ne |
546 |
1.5251 |
nd |
587.5 |
1.5230 |
nD |
589.3 |
1.5229 |
nC' |
644 |
1.5207 |
nC |
656 |
1.5203 |
Other specialty glass materials from SCHOTT in our extensive delivery program are N-BK7, BOROFLOAT®, AF 32® eco, AS 87 eco, D263 T, and MEMpax®. For further details, please feel free to send an information inquiry.
All data and specifications given are average guide values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.
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Last update: June 27, 2025