M-NBFD83 by Hoya

Obsolete Unknown Precision Molding Environmentally Friendly

M-NBFD83 by Hoya is an obsolete optical glass. It transmits from 0.35 to 1.55 µm with an nd of 1.820268 and a Vd of 29.696286. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K), good chemical resistance, and precision molding compatibility.

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: 0.350–1.550 µm
Optical Properties
Refractive Index (nd) 1.820268
Abbe Number (Vd) 29.696286
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{3.19076 - 0.0140288\,\lambda^2 + 0.0380365\,\lambda^{-2} + 0.00231116\,\lambda^{-4} - 0.000142447\,\lambda^{-6} + 1.92207 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.52
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 2
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
E37-30 Corning 1.836406 30.205692
LASF32 Schott 1.803493 30.397148
S-NBH55 Ohara 1.799999 29.844688
LAF9 Schott 1.79504 28.393185
H-ZLAF56B CDGM 1.8061 33.268324
H-ZLAF76A CDGM 1.85013 30.012319
H-ZLAF76 CDGM 1.85013 30.055517
S-NBH57 Ohara 1.850249 30.046429
IRG3 Generic IR 1.844836 32.330322
K-PSFn185(M) Sumita 1.84524 27.1
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
NBFD15 Hoya 1.8061 33.27
NBFD15-W Hoya 1.8061 33.27
NBFD26 Hoya 1.83401 25.97
FD6 Hoya 1.805184 25.465194
FD60-W Hoya 1.80518 25.46
FD60 Hoya 1.80518 25.46
TAFD9 Hoya 1.850299 32.181026
NBFD30 Hoya 1.85883 30.0
M-FDS910 Hoya 1.82115 24.06
MP-FDS910-50 Hoya 1.82165 24.04
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