TAFD55 by Hoya

Standard Rare Environmentally Dangerous

TAFD55 by Hoya is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 2.50 µm with an nd of 2.001 and a Vd of 29.13. It has medium thermal expansion (CTE of 7.3×10⁻⁶/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) 2.001
Abbe Number (Vd) 29.13
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.83176 - 0.0152664\,\lambda^2 + 0.0545738\,\lambda^{-2} + 0.00231093\,\lambda^{-4} - 4.44762 \times 10^{-5}\,\lambda^{-6} + 1.61439 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.3
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.17 \times 10^{-7} + 2(8.97 \times 10^{-9})\,\Delta T + 3(-4.73 \times 10^{-11})\,\Delta T^2 + \frac{1.05 \times 10^{-6} + 2(8.82 \times 10^{-10})\,\Delta T}{\lambda - 0.262}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.12
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

General glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAH99 Ohara 2.001 29.139473
S-LAH99W Ohara 2.001 29.139473
REALVIEW_2.0 Schott 2.001017 29.14
H-ZLAF91 CDGM 2.001 29.151347
H-ZLAF92 CDGM 2.0033 28.316305
H-ZLAF92A CDGM 2.0033 28.275906
S-LAH79 Ohara 2.0033 28.27328
CAMOO4 Generic Birefringent 1.992539 28.832428
K-BOC20 Sumita 2.0054 27.7
CAMOO4-E Generic Birefringent 2.002336 26.628162
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
TAFD55-W Hoya 2.001 29.13
TAFD40 Hoya 2.00069 25.46
TAFD40-W Hoya 2.00069 25.46
TAFD43 Hoya 2.002944 23.512743
MP-TAFD405 Hoya 1.9515 29.83
M-TAFD405 Hoya 1.9515 29.83
TAFD65 Hoya 2.0509 26.94
TAFD45 Hoya 1.95375 32.32
TAFD45L Hoya 1.95375 32.32
NBFD265 Hoya 1.95203 26.2
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