E-FD2 by Hoya

Standard Rare Environmentally Friendly

E-FD2 by Hoya is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 1.55 µm with an nd of 1.64769 and a Vd of 33.84. It has medium thermal expansion (CTE of 8.8×10⁻⁶/K) and excellent chemical resistance.

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: 0.360–1.550 µm
Optical Properties
Refractive Index (nd) 1.64769
Abbe Number (Vd) 33.84
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{2.63996 - 0.0116457\,\lambda^2 + 0.0230617\,\lambda^{-2} + 0.00173482\,\lambda^{-4} - 0.000139861\,\lambda^{-6} + 1.39167 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.8
TCE 100/300°C (10-6/K) 10.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.77
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
H-ZF1 CDGM 1.64769 33.840317
ZF1 CDGM 1.647693 33.836872
SF2 Schott 1.64769 33.85
N-SF2 Schott 1.64769 33.82
PBM22 Ohara 1.647689 33.802937
S-TIM22 Ohara 1.647689 33.792803
H-ZF1A CDGM 1.64769 33.887993
SF2 Sumita 1.64769 33.9
SF12 Schott 1.64831 33.841187
SF12 Sumita 1.64831 33.8
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
FD2 Hoya 1.647693 33.836872
FD12 Hoya 1.648308 33.793909
FD9 Hoya 1.654462 33.717017
FD7 Hoya 1.639803 34.568909
E-FD7 Hoya 1.6398 34.57
F6 Hoya 1.636356 35.340304
FD19 Hoya 1.666797 33.059707
BAFD2 Hoya 1.664457 35.887705
F7 Hoya 1.625363 35.583498
E-F1 Hoya 1.62588 35.74
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