NBF2 by Hoya

Obsolete Unknown Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.25–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.25–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–1.550 µm
Optical Properties
Refractive Index (nd) 1.756999
Abbe Number (Vd) 47.712499
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{3.01702 - 0.0136252\,\lambda^2 + 0.0241425\,\lambda^{-2} + 0.000595207\,\lambda^{-4} - 1.21466 \times 10^{-5}\,\lambda^{-6} + 1.44455 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.3
TCE 100/300°C (10-6/K) 70.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.12336 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.25
Relative Cost 7.7
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 4
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
H-LAF6LA CDGM 1.757 47.711817
LAFN24 Schott 1.757191 47.81177
LAM54 Ohara 1.756998 47.815604
S-LAM54 Ohara 1.756998 47.82317
LAFN8 Sumita 1.756 47.6
S-LAH96 Ohara 1.76385 48.488692
L-LAH91 Ohara 1.7645 49.096913
L-LAH87 Ohara 1.7703 47.401904
K-LaFK50T(M) Sumita 1.76209 49.6
D-LAF050-25 CDGM 1.76709 49.197491
Similar Glasses (Hoya)
Glass Manufacturer nd Vd
M-TAF101 Hoya 1.76802 49.24
MP-TAF101-100 Hoya 1.76902 49.29
MC-TAF101-100 Hoya 1.76902 49.29
MP-TAF401 Hoya 1.77377 47.17
M-TAF401 Hoya 1.77377 47.17
MC-TAF401 Hoya 1.77377 47.17
NBF1 Hoya 1.7433 49.22
M-NBF1 Hoya 1.7433 49.33
MP-NBF1 Hoya 1.7433 49.33
MC-NBF1 Hoya 1.7433 49.33
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