BPH50 by Ohara

Obsolete Unknown Environmentally Dangerous

BPH50 by Ohara is an obsolete optical glass. It transmits from 0.35 to 0.70 µm with an nd of 1.739997 and a Vd of 31.710001. It has low thermal expansion (CTE of 5.6×10⁻⁶/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: 0.350–0.700 µm
Optical Properties
Refractive Index (nd) 1.739997
Abbe Number (Vd) 31.710001
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.92715 - 0.0119702\,\lambda^2 + 0.0319225\,\lambda^{-2} + 0.00154575\,\lambda^{-4} - 6.35073 \times 10^{-5}\,\lambda^{-6} + 9.68351 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.6
TCE 100/300°C (10-6/K) 6.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.335 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.48
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 52
Alkali Resistance —
Phosphate Resistance 4
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
KZFS50 Sumita 1.74 31.7
ADF505 Hoya 1.739996 31.655919
BASF54 Schott 1.73627 32.149453
NBFD32 Hoya 1.73037 32.23
LAFN12 Sumita 1.7569 31.7
NBFD9 Hoya 1.756898 31.798532
LAF11A Schott 1.756927 31.702906
N-LAF7 Schott 1.7495 34.82
ADF455 Hoya 1.71852 33.456548
H-ZF5 CDGM 1.74 28.295649
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-NBH53 Ohara 1.737999 32.261312
S-NBH53V Ohara 1.737999 32.32659
S-TIH3 Ohara 1.739998 28.296005
PBH3W Ohara 1.739998 28.287409
PBH3 Ohara 1.739998 28.283809
BPH45 Ohara 1.718502 33.515702
PBH18 Ohara 1.721506 29.243262
S-TIH18 Ohara 1.721507 29.23233
PBH10 Ohara 1.728249 28.4623
S-TIH10 Ohara 1.72825 28.460599
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