FD13 by Hoya

Obsolete Unknown Environmentally Dangerous

FD13 by Hoya is an obsolete optical glass. It transmits from 0.37 to 1.55 µm with an nd of 1.740774 and a Vd of 27.764991. It has medium thermal expansion (CTE of 7.7×10⁻⁶/K), excellent chemical resistance, 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: 0.370–1.550 µm
Optical Properties
Refractive Index (nd) 1.740774
Abbe Number (Vd) 27.764991
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{2.89878 - 0.00209066\,\lambda^2 + 0.0476657\,\lambda^{-2} - 0.0020122\,\lambda^{-4} + 0.000503405\,\lambda^{-6} - 1.68061 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.7
TCE 100/300°C (10-6/K) 88.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.87512 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.51
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
ZF50 CDGM 1.74077 27.76788
H-ZF50 CDGM 1.74077 27.760063
S-TIH13 Ohara 1.740769 27.789359
PBH13W Ohara 1.740769 27.793228
PBH13 Ohara 1.740769 27.793228
SF13 Sumita 1.74077 27.7
SF13 Schott 1.740771 27.59998
SF54 Schott 1.7408 28.090813
D40-28 Corning 1.740001 28.102623
SF3 Sumita 1.74 28.2
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
E-FD13 Hoya 1.74077 27.76
FD3 Hoya 1.739999 28.245048
FD41 Hoya 1.750839 27.686615
FD10 Hoya 1.728252 28.319563
E-FD10L Hoya 1.72825 28.32
E-FD10 Hoya 1.72825 28.32
FDS2 Hoya 1.7283 28.674457
FD4 Hoya 1.755199 27.530242
E-FD4 Hoya 1.7552 27.53
E-FD4L Hoya 1.7552 27.53
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