PBL26 by Ohara

Obsolete Unknown Environmentally Dangerous

PBL26 by Ohara is an obsolete optical glass. It transmits from 0.31 to 2.40 µm with an nd of 1.567322 and a Vd of 42.831708. It has medium thermal expansion (CTE of 8.9×10⁻⁶/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: 0.310–2.400 µm
Optical Properties
Refractive Index (nd) 1.567322
Abbe Number (Vd) 42.831708
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.23495\,\lambda^2}{\lambda^2 - 0.00862848} + \frac{0.169136\,\lambda^2}{\lambda^2 - 0.0422686} + \frac{1.09067\,\lambda^2}{\lambda^2 - 132.797}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.9
TCE 100/300°C (10-6/K) 10.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.677 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.1
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
E-FL6 Hoya 1.56732 42.84
FL6 Hoya 1.567324 42.843119
LF6HT Schott 1.56732 42.847665
H-QF56 CDGM 1.56732 42.810117
LF6 Sumita 1.56732 42.8
LF1 Sumita 1.57309 42.7
FL1 Hoya 1.573091 42.586108
IRG7 Generic IR 1.564424 43.736647
LF8 Schott 1.564435 43.75028
FL7 Hoya 1.57501 41.509668
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-TIL26 Ohara 1.567322 42.817076
PBL26Y Ohara 1.567322 42.855569
PBL21 Ohara 1.573092 42.576094
S-TIL27 Ohara 1.575006 41.505207
PBL27 Ohara 1.575006 41.491052
PBL35Y Ohara 1.581591 40.855991
PBL25Y Ohara 1.581439 40.768047
PBL25 Ohara 1.581439 40.753351
S-TIL25 Ohara 1.581439 40.747566
PBL22 Ohara 1.589206 41.07921
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