BAK5 by Schott

Obsolete Unknown Environmentally Dangerous

BAK5 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.556709 and a Vd of 58.649202. It has medium thermal expansion (CTE of 7.8×10⁻⁶/K) and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.556709
Abbe Number (Vd) 58.649202
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.02975\,\lambda^2}{\lambda^2 - 0.00584732} + \frac{0.356259\,\lambda^2}{\lambda^2 - 0.0204774} + \frac{0.956057\,\lambda^2}{\lambda^2 - 115.24}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.8
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.08 \times 10^{-7} + 2(1.06 \times 10^{-8})\,\Delta T + 3(9.48 \times 10^{-11})\,\Delta T^2 + \frac{3.95 \times 10^{-7} + 2(-2.33 \times 10^{-10})\,\Delta T}{\lambda - 0.252}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.02
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 —
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAL15Y Ohara 1.556711 58.679177
BAL15 Ohara 1.556711 58.689461
BAC5 Hoya 1.556708 58.562365
H-BAK5 CDGM 1.56069 58.344731
K-SKLD300(M) Sumita 1.56124 60.1
K-SKLD300 Sumita 1.5642 60.4
S-BAL41 Ohara 1.563839 60.666575
BAL41 Ohara 1.563839 60.695914
BAL11 Ohara 1.572501 57.760854
S-BAL11 Ohara 1.572501 57.74298
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BAK50 Schott 1.567736 57.990411
SK11 Schott 1.56384 60.798869
N-SK11 Schott 1.56384 60.8
N-BAK1 Schott 1.5725 57.55
BAK1 Schott 1.5725 57.54931
BAK2 Schott 1.53996 59.708588
N-BAK2 Schott 1.53996 59.71
BAK4 Schott 1.56883 56.130661
N-BAK4HT Schott 1.56883 55.98
N-BAK4 Schott 1.56883 55.98
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