PBH56 by Ohara

Special Unknown Environmentally Dangerous

PBH56 by Ohara is a special optical glass. It transmits from 0.36 to 2.40 µm with an nd of 1.84139 and a Vd of 24.559059. It has medium thermal expansion (CTE of 8.4×10⁻⁶/K), below average chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.84139
Abbe Number (Vd) 24.559059
Dispersion Formula Sellmeier
Wavelength Range 0.36 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.78553\,\lambda^2}{\lambda^2 - 0.0136046} + \frac{0.446685\,\lambda^2}{\lambda^2 - 0.0570875} + \frac{1.21749\,\lambda^2}{\lambda^2 - 129.968}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.53 \times 10^{-6} + 2(1.29 \times 10^{-8})\,\Delta T + 3(-3.4 \times 10^{-11})\,\Delta T^2 + \frac{1.93 \times 10^{-6} + 2(1.53 \times 10^{-9})\,\Delta T}{\lambda - 0.268}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.35
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 53
Alkali Resistance —
Phosphate Resistance 4
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-PSFn4(M) Sumita 1.83932 24.8
K-PSFn4 Sumita 1.844 24.8
K-PSFn3 Sumita 1.83917 23.9
SFN3 Sumita 1.84666 23.9
SFLDN3 Sumita 1.84666 23.9
FDS90-SGP Hoya 1.84666 23.84
SF57HTultra Schott 1.84666 23.83
SF57HT Schott 1.84666 23.83
SF57 Schott 1.84666 23.83
FDS9 Hoya 1.846658 23.826345
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
PBH53 Ohara 1.846658 23.885544
PBH53W Ohara 1.846658 23.885544
S-NPH53 Ohara 1.84666 23.88395
TIH53 Ohara 1.846659 23.780116
S-TIH53 Ohara 1.84666 23.77794
S-TIH53W Ohara 1.84666 23.77794
L-TIH53 Ohara 1.84666 23.773536
PBH55 Ohara 1.84986 24.054274
S-NBH56 Ohara 1.854779 24.79898
S-NPH5 Ohara 1.858955 22.728736
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