BSM25 by Ohara

Obsolete Unknown Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–0.9 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–0.9 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.380–0.700 µm
Optical Properties
Refractive Index (nd) 1.658441
Abbe Number (Vd) 50.861723
Dispersion Formula Schott
Wavelength Range 0.365 — 0.9 µm
$$n(\lambda) = \sqrt{2.69475 - 0.00956409\,\lambda^2 + 0.0197192\,\lambda^{-2} + 0.000135169\,\lambda^{-4} + 3.25055 \times 10^{-5}\,\lambda^{-6} - 8.79946 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.1799 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.49
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
BACED5 Hoya 1.65844 50.86
H-ZBAF50 CDGM 1.65844 50.852265
N-SSK5 Schott 1.65844 50.88
SSKN5 Schott 1.65844 50.882921
SSK5 Sumita 1.65844 50.8
C58-51 Corning 1.658503 51.012014
H-ZBAF3 CDGM 1.65691 51.12138
LACL4 Hoya 1.669603 51.65903
LAKN7 Sumita 1.67 51.7
K-LaKn7 Sumita 1.67 51.7
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-BSM25 Ohara 1.658441 50.877554
S-BSM71 Ohara 1.648498 53.023881
BSM71 Ohara 1.648497 53.035185
LAL56 Ohara 1.677898 50.723364
S-LAL56 Ohara 1.677898 50.722184
S-BAH11 Ohara 1.666718 48.325247
BAH11 Ohara 1.666718 48.317266
BAM9 Ohara 1.643279 47.850606
BAH10 Ohara 1.670029 47.253429
S-BAH10 Ohara 1.670029 47.230916
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