B72-57 by Corning

Standard Unknown Environmentally Friendly

B72-57 by Corning is a standard optical glass. It transmits from 0.29 to 1.80 µm with an nd of 1.572498 and a Vd of 57.494511. It has low thermal expansion (CTE of 5.7×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.29–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.29–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–1.800 µm
Optical Properties
Refractive Index (nd) 1.572498
Abbe Number (Vd) 57.494511
Dispersion Formula Schott
Wavelength Range 0.29 — 1.8 µm
$$n(\lambda) = \sqrt{2.43142 - 0.00834775\,\lambda^2 + 0.0155627\,\lambda^{-2} - 0.000282533\,\lambda^{-4} + 7.20295 \times 10^{-5}\,\lambda^{-6} - 3.45229 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) 7.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.13
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 Compare
BAK1 Sumita 1.5725 57.5
BAC1 Hoya 1.572497 57.488684
H-BAK8 CDGM 1.5725 57.486797
BAK1 Schott 1.5725 57.54931
N-BAK1 Schott 1.5725 57.55
S-BAL11 Ohara 1.572501 57.74298
BAL11 Ohara 1.572501 57.760854
BAK50 Schott 1.567736 57.990411
BAC6 Hoya 1.574441 56.357089
S-BAL14 Ohara 1.568832 56.363897
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
B69-56 Corning 1.568797 56.044859
B64-61 Corning 1.564005 60.964853
B89-61 Corning 1.588998 61.218914
C07-57 Corning 1.607504 56.610495
B39-59 Corning 1.539505 59.712433
C09-59 Corning 1.608756 59.036803
B48-53 Corning 1.547753 53.492251
B58-53 Corning 1.557511 52.533062
C13-58 Corning 1.612693 58.570371
C13-56 Corning 1.613498 56.417725
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