E-FD4L by Hoya

Preferred Very Common Environmentally Friendly

E-FD4L 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 1.7552 and a Vd of 27.53. It has medium thermal expansion (CTE of 8.2×10⁻⁶/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: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.7552
Abbe Number (Vd) 27.53
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{2.9677 - 0.0140064\,\lambda^2 + 0.0330496\,\lambda^{-2} + 0.0032455\,\lambda^{-4} - 0.000301565\,\lambda^{-6} + 3.16891 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 10.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.08 \times 10^{-6} + 2(1.18 \times 10^{-8})\,\Delta T + 3(-4.7 \times 10^{-11})\,\Delta T^2 + \frac{9.98 \times 10^{-7} + 2(1.12 \times 10^{-9})\,\Delta T}{\lambda - 0.278}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.17
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

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-ZF6 CDGM 1.7552 27.530047
ZF6 CDGM 1.755205 27.546239
PBH4W Ohara 1.755199 27.512146
PBH4 Ohara 1.755199 27.512146
S-TIH4 Ohara 1.755199 27.512089
K-SFLD4 Sumita 1.7552 27.5
SF4W Sumita 1.7552 27.5
SF4 Sumita 1.7552 27.5
SF4 Schott 1.7552 27.58
D56-27 Corning 1.755203 27.591377
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
E-FD4 Hoya 1.7552 27.53
FD4 Hoya 1.755199 27.530242
FD41 Hoya 1.750839 27.686615
FDS5 Hoya 1.761804 26.914901
FD140 Hoya 1.76182 26.61
FD14 Hoya 1.761823 26.552048
E-FD13 Hoya 1.74077 27.76
FD13 Hoya 1.740774 27.764991
FD3 Hoya 1.739999 28.245048
FF8 Hoya 1.75211 25.05
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