TAFD75-W by Hoya

Preferred Very Common Environmentally Dangerous

TAFD75-W 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 2.102 and a Vd of 23.39. It has medium thermal expansion (CTE of 7.2×10⁻⁶/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) 2.102
Abbe Number (Vd) 23.39
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{4.17799 - 0.0181222\,\lambda^2 + 0.0723232\,\lambda^{-2} + 0.00476421\,\lambda^{-4} - 0.000251509\,\lambda^{-6} + 4.70406 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.2
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-6.71 \times 10^{-7} + 2(8.3 \times 10^{-9})\,\Delta T + 3(-1.22 \times 10^{-11})\,\Delta T^2 + \frac{1.61 \times 10^{-6} + 2(1.65 \times 10^{-9})\,\Delta T}{\lambda - 0.232}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.07
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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Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
E-FDS3-W Hoya 2.1042 17.02
E-FDS3 Hoya 2.1042 17.02
TAFD65 Hoya 2.0509 26.94
TAFD43 Hoya 2.002944 23.512743
TAFD40-W Hoya 2.00069 25.46
TAFD40 Hoya 2.00069 25.46
E-FDS2 Hoya 2.00272 19.32
MP-FDS2 Hoya 2.00178 19.32
M-FDS2 Hoya 2.00178 19.32
MC-FDS2 Hoya 2.00178 19.32
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