NBFD40 by Hoya

Obsolete Unknown Environmentally Dangerous

NBFD40 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.829 and a Vd of 36.496616. 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) 1.829
Abbe Number (Vd) 36.496616
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{3.24174 - 0.0125705\,\lambda^2 + 0.0329637\,\lambda^{-2} + 0.00163998\,\lambda^{-4} - 8.60514 \times 10^{-5}\,\lambda^{-6} + 9.709 \times 10^{-6}\,\lambda^{-8}}$$
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
S-LAH60 Ohara 1.834 37.160487
LAH60 Ohara 1.834 37.166863
S-LAH60MQ Ohara 1.833999 37.172099
LASFN14 Sumita 1.834 37.2
S-LAH60V Ohara 1.833999 37.206855
H-ZLAF53BGT CDGM 1.834 37.210555
H-ZLAF53B CDGM 1.834 37.210555
K-LaSFn14 Sumita 1.834 37.3
N-LASF40 Schott 1.83404 37.3
LASF14A Schott 1.822226 37.454652
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
M-NBFD10 Hoya 1.83441 37.29
NBFD10 Hoya 1.834 37.34
MP-NBFD10-20 Hoya 1.83461 37.29
M-NBFD82 Hoya 1.814741 37.027807
NBFD8 Hoya 1.807401 35.542096
TAFD13 Hoya 1.855396 36.557002
NBFD15-W Hoya 1.8061 33.27
NBFD15 Hoya 1.8061 33.27
NBFD3 Hoya 1.8045 39.64
M-TAFD315 Hoya 1.85135 40.07
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