FK3 by Schott

Obsolete Unknown Environmentally Dangerous

FK3 by Schott is an obsolete optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.4645 and a Vd of 65.77. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), below average chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.4645
Abbe Number (Vd) 65.77
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{0.973347\,\lambda^2}{\lambda^2 - 0.00640795} + \frac{0.146642\,\lambda^2}{\lambda^2 - 0.0205653} + \frac{0.679304\,\lambda^2}{\lambda^2 - 80.4965}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.4
Thermal Conductivity (W/mK) 0.9
Heat Capacity (J/gK) 0.84
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.9 \times 10^{-6} + 2(1.23 \times 10^{-8})\,\Delta T + 3(-1.19 \times 10^{-10})\,\Delta T^2 + \frac{3.45 \times 10^{-7} + 2(7.72 \times 10^{-10})\,\Delta T}{\lambda - 0.18}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.27
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 46.0
Poisson's Ratio 0.24
Knoop Hardness (kgf/mm²) 380.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance 3
Acid Resistance 52
Alkali Resistance 2
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FC3 Hoya 1.464502 65.767612
A63-65 Corning 1.464501 65.763211
FSL3 Ohara 1.464499 65.938855
FC1 Hoya 1.470787 66.706713
H-QK1 CDGM 1.47047 66.876032
HOMOSIL Heraeus 1.458563 67.664757
HERASIL Heraeus 1.458563 67.664757
INFRASIL Heraeus 1.458563 67.664757
HOQ Heraeus 1.458563 67.664757
C79-80 Corning 1.458467 67.795012
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LITHOSIL-Q Schott 1.45844 67.83
BK3 Schott 1.498311 65.063609
N-BK10 Schott 1.49782 66.95
BK10 Schott 1.497821 66.95447
PK1 Schott 1.503781 66.921827
FK5 Schott 1.48749 70.405771
N-FK5 Schott 1.48749 70.41
FK5HTi Schott 1.48748 70.47
K11 Schott 1.50013 61.438579
BK1 Schott 1.510091 63.464788
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