PBM35 by Ohara

Obsolete Unknown Environmentally Dangerous

PBM35 by Ohara is an obsolete optical glass. It transmits from 0.37 to 0.70 µm with an nd of 1.698947 and a Vd of 30.121211. It has medium thermal expansion (CTE of 7.4×10⁻⁶/K), excellent 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: 0.370–0.700 µm
Optical Properties
Refractive Index (nd) 1.698947
Abbe Number (Vd) 30.121211
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.79346 - 0.0119163\,\lambda^2 + 0.0272527\,\lambda^{-2} + 0.00264773\,\lambda^{-4} - 0.000227216\,\lambda^{-6} + 2.04119 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.4
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.239 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.1
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 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C99-30 Corning 1.699002 30.107427
SF15 Schott 1.69895 30.07
ZF11 CDGM 1.698949 30.065686
FD15 Hoya 1.698945 30.050548
H-ZF11 CDGM 1.69894 30.05045
E-FD15 Hoya 1.69895 30.05
E-FD15L Hoya 1.69895 30.05
N-SF15 Schott 1.69892 30.2
SF15 Sumita 1.69895 30.0
N-SF64 Schott 1.70591 30.23
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-TIM35 Ohara 1.698947 30.127865
L-TIM28P Ohara 1.694529 30.655992
S-TIH20 Ohara 1.70585 30.244176
L-TIM28 Ohara 1.689479 31.023399
S-TIM28 Ohara 1.688931 31.07545
PBM28W Ohara 1.68893 31.082901
PBM28 Ohara 1.68893 31.082901
S-TIH1 Ohara 1.717362 29.518091
PBH1 Ohara 1.717362 29.513538
PBH18 Ohara 1.721506 29.243262
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