N-KZFS4HT by Schott

Obsolete Unknown Environmentally Friendly

N-KZFS4HT by Schott is an obsolete optical glass. It transmits from 0.32 to 2.50 µm with an nd of 1.61336 and a Vd of 44.49. It has medium thermal expansion (CTE of 7.3×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.32–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.32–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.500 µm
Optical Properties
Refractive Index (nd) 1.61336
Abbe Number (Vd) 44.49
Dispersion Formula Sellmeier
Wavelength Range 0.32 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.35055\,\lambda^2}{\lambda^2 - 0.00876282} + \frac{0.197576\,\lambda^2}{\lambda^2 - 0.0371767} + \frac{1.09963\,\lambda^2}{\lambda^2 - 90.3867}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.3
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) 0.84
Heat Capacity (J/gK) 0.76
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.81 \times 10^{-6} + 2(1.16 \times 10^{-8})\,\Delta T + 3(-7.99 \times 10^{-12})\,\Delta T^2 + \frac{6.2 \times 10^{-7} + 2(7.94 \times 10^{-10})\,\Delta T}{\lambda - 0.205}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.002
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 78.0
Poisson's Ratio 0.24
Knoop Hardness (kgf/mm²) 520.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 3
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C13-44 Corning 1.613394 44.386543
ADF10 Hoya 1.613102 44.361138
E-ADF10 Hoya 1.6131 44.36
ADF40 Hoya 1.6134 44.290061
LAF45 Hoya 1.61396 44.29
S-NBM51 Ohara 1.613397 44.267706
BPM51 Ohara 1.613397 44.266767
C16-44 Corning 1.616002 44.416477
H-TF3L CDGM 1.6134 44.107022
ADF4 Hoya 1.612498 44.873885
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-KZFS4 Schott 1.61336 44.49
KZFS1 Schott 1.613099 44.339473
KZFSN4 Schott 1.6134 44.29
BAF4 Schott 1.605621 43.929699
N-BAF4 Schott 1.60568 43.72
BAF52 Schott 1.608589 46.44241
N-BAF52 Schott 1.60863 46.6
BAF8 Schott 1.62374 47.000909
KZFSN9 Schott 1.598557 46.903842
N-KZFS11 Schott 1.63775 42.41
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