TAFD5 by Hoya

Obsolete Unknown Environmentally Dangerous

TAFD5 by Hoya is an obsolete optical glass. It transmits from 0.32 to 1.55 µm with an nd of 1.835 and a Vd of 42.984244. It has low thermal expansion (CTE of 6.4×10⁻⁶/K), good chemical resistance, high relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.25–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.25–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–1.550 µm
Optical Properties
Refractive Index (nd) 1.835
Abbe Number (Vd) 42.984244
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{3.27291 - 0.0128883\,\lambda^2 + 0.0334514\,\lambda^{-2} - 6.82214 \times 10^{-5}\,\lambda^{-4} + 0.000112154\,\lambda^{-6} - 4.04857 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.4
TCE 100/300°C (10-6/K) 79.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.93816 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.92
Relative Cost 18.7
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-LASF41 Schott 1.83501 43.13
S-LAH55VS Ohara 1.834809 42.74368
S-LAH55V Ohara 1.834807 42.725324
H-ZLAF55D CDGM 1.83481 42.725177
LAH55 Ohara 1.834807 42.72372
S-LAH55 Ohara 1.834807 42.713673
H-ZLAF55C CDGM 1.83481 42.711575
K-LaSFn8 Sumita 1.835 42.7
LASFN8 Sumita 1.835 42.7
K-LaSFn8W Sumita 1.8349 42.7
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
TAFD5F Hoya 1.83481 42.72
TAFD5G Hoya 1.83481 42.72
TAFD6 Hoya 1.847498 43.033415
MC-TAFD51-50 Hoya 1.8213 42.72
MP-TAFD51-50 Hoya 1.8213 42.72
M-TAFD51 Hoya 1.8208 42.71
TAFD34 Hoya 1.85033 42.7
TAFD10 Hoya 1.815502 44.5379
MC-TAFD305 Hoya 1.85135 40.1
MP-TAFD305 Hoya 1.85135 40.1
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