BAF9 by Schott

Obsolete Unknown Environmentally Dangerous

BAF9 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.33 µm with an nd of 1.643276 and a Vd of 47.958224. It has low thermal expansion (CTE of 6.5×10⁻⁶/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: 0.350–2.325 µm
Optical Properties
Refractive Index (nd) 1.643276
Abbe Number (Vd) 47.958224
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.51019\,\lambda^2}{\lambda^2 - 0.00918095} + \frac{0.133637\,\lambda^2}{\lambda^2 - 0.041645} + \frac{0.953994\,\lambda^2}{\lambda^2 - 108.049}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.5
TCE 100/300°C (10-6/K) 7.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.75 \times 10^{-6} + 2(1.36 \times 10^{-8})\,\Delta T + 3(-1.07 \times 10^{-11})\,\Delta T^2 + \frac{7.01 \times 10^{-7} + 2(8.67 \times 10^{-10})\,\Delta T}{\lambda - 0.208}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.85
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

old

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAF9 Hoya 1.643278 47.941673
BAM9 Ohara 1.643279 47.850606
K-BaF9 Sumita 1.64328 47.8
BAF9 Sumita 1.64328 47.8
ZBAF2 CDGM 1.639616 48.230454
C48-46 Corning 1.647747 46.227993
CALCITE Generic IR 1.658643 48.541403
CALCITE Generic Birefringent 1.658643 48.541403
BAF8 Sumita 1.62374 47.1
K-BaF8 Sumita 1.62374 47.1
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BAF8 Schott 1.62374 47.000909
BAFN11 Schott 1.666721 48.421391
N-BAF51 Schott 1.65224 44.96
BAF51 Schott 1.652242 44.930457
N-SSK20 Schott 1.62568 50.2
N-SSK5 Schott 1.65844 50.88
SSKN5 Schott 1.65844 50.882921
N-BAF10 Schott 1.67003 47.11
BAFN10 Schott 1.670031 47.108735
SSKN8 Schott 1.61772 49.771451
Compare Glasses
    Compare Selected