NBFD265 by Hoya

Preferred Very Common Environmentally Dangerous

NBFD265 by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.37 to 2.50 µm with an nd of 1.95203 and a Vd of 26.2. 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: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.95203
Abbe Number (Vd) 26.2
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.64156 - 0.0178332\,\lambda^2 + 0.0497791\,\lambda^{-2} + 0.00436655\,\lambda^{-4} - 0.000355388\,\lambda^{-6} + 4.03181 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 8.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.74 \times 10^{-7} + 2(1.03 \times 10^{-8})\,\Delta T + 3(-2.05 \times 10^{-11})\,\Delta T^2 + \frac{1.07 \times 10^{-6} + 2(1.01 \times 10^{-9})\,\Delta T}{\lambda - 0.274}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.24
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

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-TIH57 Ohara 1.963 24.1144
N-LASF55 Schott 1.9538 30.56
K-PSFn5 Sumita 1.9211 22.4
SRMOO4-E Generic Birefringent 1.913456 28.381356
SF59 Schott 1.952497 20.363706
H-ZLAF89LA CDGM 1.95375 32.276235
CAMOO4 Generic Birefringent 1.992539 28.832428
H-ZLAF89L CDGM 1.95375 32.30879
S-LAH98 Ohara 1.953749 32.324727
K-PSFn5(M) Sumita 1.91643 22.4
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
TAFD21 Hoya 1.9326 27.921009
MP-TAFD405 Hoya 1.9515 29.83
M-TAFD405 Hoya 1.9515 29.83
FDS24-SW Hoya 1.92119 23.96
FDS24 Hoya 1.92119 23.96
FDS24-W Hoya 1.92119 23.96
TAFD45 Hoya 1.95375 32.32
TAFD45L Hoya 1.95375 32.32
FDS1 Hoya 1.922859 20.883457
M-FDS1 Hoya 1.92286 20.88
Compare Glasses
    Compare Selected