BASF57 by Schott

Obsolete Unknown Environmentally Dangerous

BASF57 by Schott is an obsolete optical glass. It transmits from 0.36 to 2.33 µm with an nd of 1.651474 and a Vd of 41.901823. It has medium thermal expansion (CTE of 7.1×10⁻⁶/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: 0.365–2.325 µm
Optical Properties
Refractive Index (nd) 1.651474
Abbe Number (Vd) 41.901823
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.47161\,\lambda^2}{\lambda^2 - 0.00915436} + \frac{0.190746\,\lambda^2}{\lambda^2 - 0.0444771} + \frac{1.04759\,\lambda^2}{\lambda^2 - 110.563}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.79 \times 10^{-6} + 2(1.69 \times 10^{-8})\,\Delta T + 3(7.21 \times 10^{-12})\,\Delta T^2 + \frac{6.81 \times 10^{-7} + 2(2.55 \times 10^{-10})\,\Delta T}{\lambda - 0.259}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.73
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
BPH35 Ohara 1.644496 40.817749
ADF355 Hoya 1.6445 40.762285
C55-40 Corning 1.6555 40.115717
C38-42 Corning 1.637752 42.433862
BASF6 Sumita 1.66755 41.9
BAFD6 Hoya 1.66755 41.933458
BAH26 Ohara 1.667551 41.927521
ZBAF17 CDGM 1.667554 41.957211
BPH5 Ohara 1.654115 39.687638
S-NBH5 Ohara 1.654115 39.682794
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-KZFS11 Schott 1.63775 42.41
BASF6 Schott 1.667551 41.931404
N-KZFS5 Schott 1.65412 39.7
KZFSN5 Schott 1.65412 39.63
BASF10 Schott 1.65016 39.148818
BAF51 Schott 1.652242 44.930457
N-BAF51 Schott 1.65224 44.96
BASF12 Schott 1.669979 39.200523
BAF13 Schott 1.668919 44.961828
BASF1 Schott 1.626061 38.962861
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