BASF64A by Schott

Obsolete Unknown Environmentally Dangerous

BASF64A by Schott is an obsolete optical glass. It transmits from 0.36 to 2.33 µm with an nd of 1.704 and a Vd of 39.384429. It has medium thermal expansion (CTE of 7.3×10⁻⁶/K), good chemical resistance, moderate relative cost, 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: 0.365–2.325 µm
Optical Properties
Refractive Index (nd) 1.704
Abbe Number (Vd) 39.384429
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.65554\,\lambda^2}{\lambda^2 - 0.0104486} + \frac{0.17132\,\lambda^2}{\lambda^2 - 0.0499395} + \frac{1.33664\,\lambda^2}{\lambda^2 - 118.961}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.3
TCE 100/300°C (10-6/K) 8.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.6 \times 10^{-6} + 2(1.02 \times 10^{-8})\,\Delta T + 3(-2.68 \times 10^{-11})\,\Delta T^2 + \frac{7.87 \times 10^{-7} + 2(9.65 \times 10^{-10})\,\Delta T}{\lambda - 0.229}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.2
Relative Cost 5.26
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 3
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAH71 Ohara 1.701998 40.097173
BAFD15 Hoya 1.701999 40.195943
K-ZnSF8(M) Sumita 1.71143 38.9
ZNSF8 Sumita 1.7143 38.9
K-ZnSF8 Sumita 1.7143 38.9
BASF7 Sumita 1.70154 41.1
D01-41 Corning 1.701805 41.110216
H-ZBAF20 CDGM 1.70154 41.148468
BAFD7 Hoya 1.70154 41.15
BAH77 Ohara 1.701539 41.21001
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-BASF64 Schott 1.704 39.38
BASF13 Schott 1.69761 38.570097
BASF52 Schott 1.70181 41.010234
BASF51 Schott 1.723728 38.111094
KZFS12 Schott 1.696 36.29
KZFS7A Schott 1.68064 37.389991
BASF12 Schott 1.669979 39.200523
LAFN8 Schott 1.735197 41.590899
N-KZFS8 Schott 1.72047 34.7
KZFS8 Schott 1.72047 34.613955
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