FD225 by Hoya

Preferred Very Common Environmentally Dangerous

FD225 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 1.80809 and a Vd of 22.76. It has medium thermal expansion (CTE of 9.6×10⁻⁶/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) 1.80809
Abbe Number (Vd) 22.76
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.11899 - 0.0158208\,\lambda^2 + 0.044425\,\lambda^{-2} + 0.00358349\,\lambda^{-4} - 0.000239434\,\lambda^{-6} + 3.87565 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.6
TCE 100/300°C (10-6/K) 11.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.09 \times 10^{-5} + 2(4.1 \times 10^{-9})\,\Delta T + 3(-1.04 \times 10^{-11})\,\Delta T^2 + \frac{1.01 \times 10^{-6} + 2(1.33 \times 10^{-9})\,\Delta T}{\lambda - 0.307}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.32
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-NPH1 Ohara 1.808095 22.760817
S-NPH1W Ohara 1.808095 22.760817
H-ZF71 CDGM 1.8081 22.698087
H-ZF71GT CDGM 1.8081 22.698087
SFLD20 Sumita 1.81786 23.7
K-CD180 Sumita 1.80645 24.4
SFLD60 Sumita 1.80645 24.4
K-SFLD66 Sumita 1.79925 24.6
SFLD66 Sumita 1.79925 24.6
K-CD180(M) Sumita 1.79912 24.7
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
M-FDS910 Hoya 1.82115 24.06
MC-FDS910-50 Hoya 1.82165 24.04
MP-FDS910-50 Hoya 1.82165 24.04
FD60-W Hoya 1.80518 25.46
FD60 Hoya 1.80518 25.46
FD6 Hoya 1.805184 25.465194
FD11 Hoya 1.784715 25.704276
FD110 Hoya 1.78472 25.72
FDS3 Hoya 1.7847 26.057653
FDS30 Hoya 1.784701 26.102957
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