NBFD9 by Hoya

Obsolete Unknown Environmentally Dangerous

NBFD9 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.756898 and a Vd of 31.798532. 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) 1.756898
Abbe Number (Vd) 31.798532
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.98288 - 0.0115477\,\lambda^2 + 0.0328352\,\lambda^{-2} + 0.00163548\,\lambda^{-4} - 7.36858 \times 10^{-5}\,\lambda^{-6} + 1.07051 \times 10^{-5}\,\lambda^{-8}}$$
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
LAF11A Schott 1.756927 31.702906
LAFN12 Sumita 1.7569 31.7
BPH50 Ohara 1.739997 31.710001
KZFS50 Sumita 1.74 31.7
S-NBH53 Ohara 1.737999 32.261312
S-NBH53V Ohara 1.737999 32.32659
H-TF29 CDGM 1.77047 29.806014
BASF54 Schott 1.73627 32.149453
N-LAF7 Schott 1.7495 34.82
LAFN7 Schott 1.7495 34.95
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
ADF505 Hoya 1.739996 31.655919
NBFD29 Hoya 1.77047 29.74
E-LAF7 Hoya 1.7495 35.04
LAF7 Hoya 1.749497 35.042695
NBFD32 Hoya 1.73037 32.23
FD41 Hoya 1.750839 27.686615
FD3 Hoya 1.739999 28.245048
FD4 Hoya 1.755199 27.530242
E-FD4 Hoya 1.7552 27.53
E-FD4L Hoya 1.7552 27.53
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