B69-56 by Corning

Standard Unknown Environmentally Friendly
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–1.800 µm
Optical Properties
Refractive Index (nd) 1.568797
Abbe Number (Vd) 56.044859
Dispersion Formula Schott
Wavelength Range 0.3 — 1.8 µm
$$n(\lambda) = \sqrt{2.42142 - 0.00908913\,\lambda^2 + 0.0140738\,\lambda^{-2} + 0.000229363\,\lambda^{-4} + 6.54601 \times 10^{-6}\,\lambda^{-6} - 1.46188 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.9
TCE 100/300°C (10-6/K) 7.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.3 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.09
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
H-BAK7 CDGM 1.56883 56.041308
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BAC4 Hoya 1.56883 56.04
BAK4 Sumita 1.56883 56.0
N-BAK4 Schott 1.56883 55.98
N-BAK4HT Schott 1.56883 55.98
H-BAK7A CDGM 1.568828 56.127804
BAK4 Schott 1.56883 56.130661
BAL14 Ohara 1.568832 56.339266
S-BAL14 Ohara 1.568832 56.363897
Similar Glasses (Corning)
Glass Manufacturer nd Vd
B72-57 Corning 1.572498 57.494511
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C13-56 Corning 1.613498 56.417725
C09-59 Corning 1.608756 59.036803
C13-58 Corning 1.612693 58.570371
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