BSM9 by Ohara

Obsolete Unknown Environmentally Dangerous

BSM9 by Ohara is an obsolete optical glass. It transmits from 0.31 to 2.40 µm with an nd of 1.614047 and a Vd of 54.971106. It has low thermal expansion (CTE of 6.1×10⁻⁶/K), below average chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.400 µm
Optical Properties
Refractive Index (nd) 1.614047
Abbe Number (Vd) 54.971106
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.09509\,\lambda^2}{\lambda^2 - 0.00535489} + \frac{0.46423\,\lambda^2}{\lambda^2 - 0.0220678} + \frac{1.20306\,\lambda^2}{\lambda^2 - 133.313}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.615 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.6
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SK9 Sumita 1.61405 55.1
H-ZK8 CDGM 1.61405 55.116283
BACD9 Hoya 1.614047 55.118097
K-SSK4 Sumita 1.61765 55.1
SSK4 Sumita 1.61765 55.1
C17-55 Corning 1.617605 55.123455
SSK4A Schott 1.61765 55.141867
BACED4 Hoya 1.617652 55.15751
H-ZK5 CDGM 1.61117 55.772437
BACD8 Hoya 1.611168 55.774369
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-BSM9 Ohara 1.614047 54.990097
BSM24 Ohara 1.617646 55.049782
S-BSM21 Ohara 1.617195 54.062144
BSM21 Ohara 1.617196 54.040511
BSM6 Ohara 1.613749 56.365919
BSM2 Ohara 1.607379 56.815789
S-BSM2 Ohara 1.607379 56.816076
BSM22 Ohara 1.622296 53.186644
S-BSM22 Ohara 1.622296 53.169067
S-BSM10 Ohara 1.622799 57.052723
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