BALF50 by Schott

Obsolete Unknown Environmentally Dangerous

BALF50 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.588931 and a Vd of 51.371228. It has medium thermal expansion (CTE of 8.3×10⁻⁶/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) 1.588931
Abbe Number (Vd) 51.371228
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.3738\,\lambda^2}{\lambda^2 - 0.00871951} + \frac{0.104741\,\lambda^2}{\lambda^2 - 0.0397153} + \frac{1.00909\,\lambda^2}{\lambda^2 - 114.462}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.3
TCE 100/300°C (10-6/K) 9.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.43 \times 10^{-6} + 2(1.21 \times 10^{-8})\,\Delta T + 3(-3.76 \times 10^{-11})\,\Delta T^2 + \frac{6.38 \times 10^{-7} + 2(7.95 \times 10^{-10})\,\Delta T}{\lambda - 0.184}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.11
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
BAL7 Ohara 1.58875 51.179278
BAFL6 Hoya 1.589036 52.935166
BALF6 Sumita 1.58904 53.2
LAF50 Hoya 1.60199 50.21
C0550 Corning 1.605004 50.419332
C05-50 Corning 1.605004 50.419332
BAFL2 Hoya 1.570989 50.858935
S-BAL2 Ohara 1.570989 50.799858
BAL2 Ohara 1.570989 50.797474
BAFL4 Hoya 1.579572 53.705963
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BALF4 Schott 1.579569 53.708241
N-BALF4 Schott 1.57956 53.87
KZFS6 Schott 1.591965 48.509579
BAFN6 Schott 1.589 48.45
SSK51 Schott 1.603607 53.631714
SSK3 Schott 1.614837 51.1603
SSK50 Schott 1.617954 52.609086
N-SSK8 Schott 1.61773 49.83
SSKN8 Schott 1.61772 49.771451
SSK1 Schott 1.617201 53.912403
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