BASF51 by Schott

Obsolete Unknown Environmentally Dangerous

BASF51 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.723728 and a Vd of 38.111094. It has low thermal expansion (CTE of 5.4×10⁻⁶/K), below average chemical resistance, high relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.235 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.235 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.500 µm
Optical Properties
Refractive Index (nd) 1.723728
Abbe Number (Vd) 38.111094
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.235 µm
$$n(\lambda) = \sqrt{1 + \frac{1.67507\,\lambda^2}{\lambda^2 - 0.0105667} + \frac{0.212822\,\lambda^2}{\lambda^2 - 0.0476665} + \frac{0.966557\,\lambda^2}{\lambda^2 - 92.0389}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.4
TCE 100/300°C (10-6/K) 6.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.09 \times 10^{-5} + 2(1.34 \times 10^{-8})\,\Delta T + 3(-3.68 \times 10^{-11})\,\Delta T^2 + \frac{9.17 \times 10^{-7} + 2(9.32 \times 10^{-10})\,\Delta T}{\lambda - 0.238}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.31
Relative Cost 8.58
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 4
Acid Resistance 52
Alkali Resistance 1
Phosphate Resistance 3
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAH78 Ohara 1.723421 38.03427
BASF8 Sumita 1.72342 38.0
D23-38 Corning 1.72349 37.995089
H-ZBAF21 CDGM 1.72341 37.991564
BAFD8 Hoya 1.72342 37.99
S-BAH28 Ohara 1.72342 37.955602
BAH28 Ohara 1.72342 37.949115
K-ZnSF8 Sumita 1.7143 38.9
ZNSF8 Sumita 1.7143 38.9
K-ZnSF8(M) Sumita 1.71143 38.9
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-BASF64 Schott 1.704 39.38
BASF64A Schott 1.704 39.384429
N-KZFS8 Schott 1.72047 34.7
KZFS8 Schott 1.72047 34.613955
BASF13 Schott 1.69761 38.570097
LAFN8 Schott 1.735197 41.590899
BASF52 Schott 1.70181 41.010234
KZFS12 Schott 1.696 36.29
LAFN7 Schott 1.7495 34.95
N-LAF7 Schott 1.7495 34.82
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