BPM4 by Ohara

Obsolete Unknown Environmentally Dangerous
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: 0.320–0.900 µm
Optical Properties
Refractive Index (nd) 1.6134
Abbe Number (Vd) 43.841533
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.54895 - 0.0129229\,\lambda^2 + 0.0184336\,\lambda^{-2} + 0.000674831\,\lambda^{-4} - 2.88376 \times 10^{-5}\,\lambda^{-6} + 3.0576 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.3
TCE 100/300°C (10-6/K) 6.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.898 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.22
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 53
Alkali Resistance —
Phosphate Resistance 4
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
KZFS4 Sumita 1.6134 43.8
H-TF3L CDGM 1.6134 44.107022
TF3 CDGM 1.612423 44.093486
KZFSN4 Schott 1.6134 44.29
ADF40 Hoya 1.6134 44.290061
LAF45 Hoya 1.61396 44.29
KZFS1 Schott 1.613099 44.339473
E-ADF10 Hoya 1.6131 44.36
ADF10 Hoya 1.613102 44.361138
C13-44 Corning 1.613394 44.386543
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
BPM51 Ohara 1.613397 44.266767
S-NBM51 Ohara 1.613397 44.267706
BAM4 Ohara 1.60562 43.723021
S-BAM4 Ohara 1.60562 43.706978
BAM25 Ohara 1.60323 42.320943
S-NBM52 Ohara 1.622049 41.079324
BAM8 Ohara 1.62374 47.09722
S-BAM12 Ohara 1.6393 44.872804
BAM12 Ohara 1.6393 44.878032
BAM23 Ohara 1.607167 40.26316
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