N-KZFS2 by Schott

Preferred Unknown Precision Molding Environmentally Friendly

N-KZFS2 by Schott is a preferred optical glass. It transmits from 0.31 to 2.50 µm with an nd of 1.55836 and a Vd of 54.01. It has low thermal expansion (CTE of 4.44×10⁻⁶/K), below average chemical resistance, high relative cost, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.500 µm
Optical Properties
Refractive Index (nd) 1.55836
Abbe Number (Vd) 54.01
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.23698\,\lambda^2}{\lambda^2 - 0.00747171} + \frac{0.153569\,\lambda^2}{\lambda^2 - 0.0308054} + \frac{0.903976\,\lambda^2}{\lambda^2 - 70.1731}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 4.44
TCE 100/300°C (10-6/K) 5.4
Thermal Conductivity (W/mK) 0.81
Heat Capacity (J/gK) 0.83
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.77 \times 10^{-6} + 2(1.31 \times 10^{-8})\,\Delta T + 3(-1.23 \times 10^{-11})\,\Delta T^2 + \frac{3.84 \times 10^{-7} + 2(5.51 \times 10^{-10})\,\Delta T}{\lambda - 0.196}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.54
Relative Cost 9.3
Mechanical Properties
Young's Modulus (GPa) 66.0
Poisson's Ratio 0.27
Knoop Hardness (kgf/mm²) 490.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 4
Acid Resistance 52
Alkali Resistance 4
Phosphate Resistance 4
Notes

suitable for precision molding. step 0.5 available

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BPG2 Sumita 1.5592 53.9
K-BPG2 Sumita 1.5592 53.9
ADF1 Hoya 1.564997 52.958253
B58-53 Corning 1.557511 52.533062
B48-53 Corning 1.547753 53.492251
BALF5 Sumita 1.54739 53.6
BAL5 Ohara 1.547393 53.550738
BALF3 Sumita 1.57135 53.0
BAFL3 Hoya 1.571348 52.982526
BAL3 Ohara 1.571351 52.968158
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
KZFSN2 Schott 1.558361 54.157173
BALF5 Schott 1.547391 53.629486
N-BALF5 Schott 1.54739 53.63
N-BAK4 Schott 1.56883 55.98
N-BAK4HT Schott 1.56883 55.98
BAK4 Schott 1.56883 56.130661
N-BALF4 Schott 1.57956 53.87
BALF4 Schott 1.579569 53.708241
BAK1 Schott 1.5725 57.54931
N-BAK1 Schott 1.5725 57.55
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