B270 by Schott

Special Unknown Environmentally Dangerous

B270 by Schott is a special optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.52308 and a Vd of 58.571369. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K) and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.334–2.500 µm
Optical Properties
Refractive Index (nd) 1.52308
Abbe Number (Vd) 58.571369
Dispersion Formula Schott
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{2.28658 - 0.00873346\,\lambda^2 + 0.0117429\,\lambda^{-2} + 0.000290418\,\lambda^{-4} - 1.25067 \times 10^{-5}\,\lambda^{-6} + 9.26463 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) 9.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.54
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-K51 CDGM 1.52307 58.639792
C12 Hoya 1.523073 58.640203
S-NSL3 Ohara 1.518229 58.902057
KN1 Sumita 1.524 59.3
C3 Hoya 1.518234 58.96082
E-C3 Hoya 1.51823 58.96
H-K10 CDGM 1.51818 58.949331
NSL3 Ohara 1.518229 58.966406
K3 Sumita 1.51823 59.0
C5 Hoya 1.522488 59.447258
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
K3 Schott 1.51823 58.976559
N-K5 Schott 1.52249 59.48
K5 Schott 1.522489 59.482671
K5HT Schott 1.522453 59.530889
K4 Schott 1.518952 57.399398
ZK1 Schott 1.533149 57.980912
K50 Schott 1.522572 60.179756
BALKN3 Schott 1.518489 60.259571
K5G20 Schott 1.52344 56.76
UK50 Schott 1.522571 60.383109
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