FK54 by Schott

Obsolete Unknown Environmentally Dangerous

FK54 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.437 and a Vd of 90.702365. It has very high thermal expansion (CTE of 14.6×10⁻⁶/K) and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.437
Abbe Number (Vd) 90.702365
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.74532\,\lambda^2}{\lambda^2 - 0.00358172} + \frac{0.30233\,\lambda^2}{\lambda^2 - 0.0122885} + \frac{1.01885\,\lambda^2}{\lambda^2 - 213.017}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 14.6
TCE 100/300°C (10-6/K) 16.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.98 \times 10^{-5} + 2(-1.04 \times 10^{-8})\,\Delta T + 3(2.37 \times 10^{-11})\,\Delta T^2 + \frac{4.17 \times 10^{-7} + 2(3.1 \times 10^{-10})\,\Delta T}{\lambda - 0.085}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.18
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SRF2 Generic IR 1.437925 91.593259
FPL52 Ohara 1.455999 90.31888
S-FPL52 Ohara 1.455999 90.288026
H-FK71A CDGM 1.456498 90.470884
H-FK71 CDGM 1.4565 90.273821
FCD10 Hoya 1.4565 90.27
K-PFK90(M) Sumita 1.45733 89.8
FCD10A Hoya 1.4586 90.19
K-PFK90 Sumita 1.4588 90.0
LIYF4 Generic Birefringent 1.453776 93.549426
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-FK58 Schott 1.456 90.9
N-FK56 Schott 1.43425 94.953489
LITHOTEC-CAF2 Schott 1.43385 95.23
ULTRAN20 Schott 1.486561 84.473976
N-FK51 Schott 1.48656 84.47
N-FK51A Schott 1.48656 84.47
FK51 Schott 1.486561 84.467994
FK52 Schott 1.486052 81.802215
N-PK52 Schott 1.497005 81.633263
N-PK52A Schott 1.497 81.61
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