BSM28 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: 0.390–0.900 µm
Optical Properties
Refractive Index (nd) 1.617722
Abbe Number (Vd) 49.83232
Dispersion Formula Schott
Wavelength Range 0.365 — 0.9 µm
$$n(\lambda) = \sqrt{2.56809 - 0.0104672\,\lambda^2 + 0.016602\,\lambda^{-2} + 0.000580935\,\lambda^{-4} - 2.35621 \times 10^{-5}\,\lambda^{-6} + 2.23114 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 9.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.9384 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.25
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
N-SSK8 Schott 1.61773 49.83
SSKN8 Schott 1.61772 49.771451
BACED9 Hoya 1.620119 49.823001
K-SSK9 Sumita 1.62012 49.8
SSK9 Sumita 1.62012 49.8
N-SSK20 Schott 1.62568 50.2
SSK3 Sumita 1.61484 51.1
K-SSK3 Sumita 1.61484 51.1
BACED3 Hoya 1.614838 51.1513
SSK3 Schott 1.614837 51.1603
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-BSM28 Ohara 1.617722 49.815052
BSM23 Ohara 1.614839 51.172377
BAM5 Ohara 1.607289 49.188575
BAM8 Ohara 1.62374 47.09722
S-BSM22 Ohara 1.622296 53.169067
BSM22 Ohara 1.622296 53.186644
BAM9 Ohara 1.643279 47.850606
BAL7 Ohara 1.58875 51.179278
BSM21 Ohara 1.617196 54.040511
S-BSM21 Ohara 1.617195 54.062144
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