BAF9 by Hoya

Obsolete Unknown Environmentally Dangerous

BAF9 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.643278 and a Vd of 47.941673. It has 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

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.643278
Abbe Number (Vd) 47.941673
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.64577 - 0.0101\,\lambda^2 + 0.0182543\,\lambda^{-2} + 0.000700704\,\lambda^{-4} - 3.69783 \times 10^{-5}\,\lambda^{-6} + 3.15327 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) —
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 —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAF9 Schott 1.643276 47.958224
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
K-BaF8 Sumita 1.62374 47.1
BAF8 Sumita 1.62374 47.1
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
BAF8 Hoya 1.623739 47.054197
E-BAF8 Hoya 1.62374 47.05
BAF12 Hoya 1.639302 45.070071
BAF21 Hoya 1.66422 48.941939
BAF11 Hoya 1.66672 48.3
BAF23 Hoya 1.652238 44.922169
ATF4 Hoya 1.653757 44.723072
BACED5 Hoya 1.65844 50.86
BACED9 Hoya 1.620119 49.823001
BAF10 Hoya 1.67003 47.2
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