FD9 by Hoya

Obsolete Unknown Environmentally Dangerous

FD9 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.654462 and a Vd of 33.717017. 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) 1.654462
Abbe Number (Vd) 33.717017
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.65744 - 0.00932561\,\lambda^2 + 0.0253655\,\lambda^{-2} + 0.00123681\,\lambda^{-4} - 5.60513 \times 10^{-5}\,\lambda^{-6} + 7.547 \times 10^{-6}\,\lambda^{-8}}$$
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
SF9 Schott 1.654461 33.651384
ZF8 CDGM 1.65446 33.651201
SF9 Sumita 1.65446 33.8
SF12 Sumita 1.64831 33.8
SF12 Schott 1.64831 33.841187
K-PSFn166(M) Sumita 1.65858 34.4
C48-34 Corning 1.647992 33.943274
S-TIM22 Ohara 1.647689 33.792803
PBM22 Ohara 1.647689 33.802937
N-SF2 Schott 1.64769 33.82
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
FD12 Hoya 1.648308 33.793909
FD2 Hoya 1.647693 33.836872
E-FD2 Hoya 1.64769 33.84
FD19 Hoya 1.666797 33.059707
FD7 Hoya 1.639803 34.568909
E-FD7 Hoya 1.6398 34.57
BAFD2 Hoya 1.664457 35.887705
FD5 Hoya 1.672701 32.173263
E-FD5 Hoya 1.6727 32.17
F6 Hoya 1.636356 35.340304
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