NBFD30 by Hoya

Preferred Very Common Environmentally Dangerous

NBFD30 by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.36 to 2.50 µm with an nd of 1.85883 and a Vd of 30.0. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K), excellent 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: 0.360–2.500 µm
Optical Properties
Refractive Index (nd) 1.85883
Abbe Number (Vd) 30.0
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.32413 - 0.0139718\,\lambda^2 + 0.0409323\,\lambda^{-2} + 0.00229156\,\lambda^{-4} - 0.000129065\,\lambda^{-6} + 1.84788 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 8.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.12 \times 10^{-6} + 2(9.35 \times 10^{-9})\,\Delta T + 3(-2.52 \times 10^{-11})\,\Delta T^2 + \frac{8.87 \times 10^{-7} + 2(9.43 \times 10^{-10})\,\Delta T}{\lambda - 0.271}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.75
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Notes

Recommended glass type

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H-ZLAF71AGT CDGM 1.85026 32.216801
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Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
TAFD9 Hoya 1.850299 32.181026
NBFD25 Hoya 1.85451 25.15
M-NBFD83 Hoya 1.820268 29.696286
NBFD26 Hoya 1.83401 25.97
TAFD20 Hoya 1.90315 29.835563
TAFD25L Hoya 1.90366 31.32
TAFD25 Hoya 1.90366 31.32
FDS90-SGP Hoya 1.84666 23.84
FDS9 Hoya 1.846658 23.826345
FDS90-SG Hoya 1.84666 23.78
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