PBM1 by Ohara

Obsolete Unknown Environmentally Dangerous

PBM1 by Ohara is an obsolete optical glass. It transmits from 0.32 to 0.90 µm with an nd of 1.625882 and a Vd of 35.700668. It has medium thermal expansion (CTE of 8.9×10⁻⁶/K), good 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: 0.320–0.900 µm
Optical Properties
Refractive Index (nd) 1.625882
Abbe Number (Vd) 35.700668
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.57438 - 0.0100025\,\lambda^2 + 0.0216638\,\lambda^{-2} + 0.00134633\,\lambda^{-4} - 8.38872 \times 10^{-5}\,\lambda^{-6} + 7.81547 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.9
TCE 100/300°C (10-6/K) 9.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.19 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.65
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
F1 Schott 1.625882 35.700495
H-F13 CDGM 1.62588 35.698971
F13 CDGM 1.625884 35.713679
E-F1 Hoya 1.62588 35.74
F1 Hoya 1.62588 35.744525
C26-36 Corning 1.625903 35.60701
F1 Sumita 1.62588 35.6
F7 Hoya 1.625363 35.583498
F7 Schott 1.625361 35.561194
H-F6 CDGM 1.62495 35.585173
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-TIM1 Ohara 1.625882 35.699614
TIM11 Ohara 1.620955 35.880852
PBM11 Ohara 1.620955 35.880852
PBM2 Ohara 1.620041 36.256658
S-TIM2 Ohara 1.620041 36.263378
PBM2Y Ohara 1.620041 36.269263
S-TIM6 Ohara 1.636358 35.391923
PBM6 Ohara 1.636358 35.376536
PBM4 Ohara 1.616588 36.632973
PBM3 Ohara 1.612929 36.994096
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