NBFD7 by Hoya

Obsolete Unknown Environmentally Dangerous

NBFD7 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.782999 and a Vd of 36.06621. 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) 1.782999
Abbe Number (Vd) 36.06621
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{3.08983 - 0.0173768\,\lambda^2 + 0.0271242\,\lambda^{-2} + 0.00244389\,\lambda^{-4} - 0.000205588\,\lambda^{-6} + 1.6662 \times 10^{-5}\,\lambda^{-8}}$$
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
H-LAF7 CDGM 1.78179 37.092107
LAF22A Schott 1.781791 37.196288
S-LAM73 Ohara 1.7936 37.08945
LAF13 Schott 1.775507 37.836043
LASF36A Schott 1.797117 35.080117
S-NBH59 Ohara 1.766342 35.82343
S-LAM66 Ohara 1.800999 34.967403
H-ZLAF66GT CDGM 1.801 34.966919
H-ZLAF66 CDGM 1.801 34.966919
LAM66 Ohara 1.800999 34.965762
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
NBFD8 Hoya 1.807401 35.542096
NBFD6 Hoya 1.756702 36.345258
NBFD15 Hoya 1.8061 33.27
NBFD15-W Hoya 1.8061 33.27
M-NBFD82 Hoya 1.814741 37.027807
NBFD3 Hoya 1.8045 39.64
LAF7 Hoya 1.749497 35.042695
E-LAF7 Hoya 1.7495 35.04
NBFD5 Hoya 1.762001 40.263213
NBFD2 Hoya 1.797199 41.143795
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