NBFD11 by Hoya

Standard Rare Environmentally Dangerous

NBFD11 by Hoya is a standard optical glass with a rare melt frequency. It transmits from 0.32 to 1.55 µm with an nd of 1.7859 and a Vd of 43.94. It has low thermal expansion (CTE of 5.7×10⁻⁶/K), average chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36501–1.5296 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36501–1.5296 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–1.550 µm
Optical Properties
Refractive Index (nd) 1.7859
Abbe Number (Vd) 43.94
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.10103 - 0.0100221\,\lambda^2 + 0.0326317\,\lambda^{-2} - 0.000810293\,\lambda^{-4} + 0.000193501\,\lambda^{-6} - 8.02798 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) 7.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.08807 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.43
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 3
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Notes

General glass Type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-LAF33 Schott 1.78582 44.05
LAFN10 Schott 1.784432 43.950523
LAH51 Ohara 1.785896 44.186159
H-LAF52 CDGM 1.7859 44.187159
S-LAH51 Ohara 1.785896 44.202637
LASFN4 Sumita 1.785 43.7
K-LaSFn4 Sumita 1.785 43.7
D96-43 Corning 1.796195 43.217783
LASFN19 Sumita 1.795 45.2
S-LAH67 Ohara 1.794997 45.293967
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
NBFD1 Hoya 1.789004 42.757634
TAF2 Hoya 1.7945 45.39
NBFD14 Hoya 1.801699 44.321602
NBFD12 Hoya 1.7995 42.34
M-TAF31 Hoya 1.80139 45.45
MC-TAF31-15 Hoya 1.80154 45.47
MP-TAF31-15 Hoya 1.80154 45.47
NBFD2 Hoya 1.797199 41.143795
TAF4 Hoya 1.788 47.49
TAF3D Hoya 1.8042 46.5
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