KZFSN2 by Schott

Obsolete Unknown Environmentally Dangerous

KZFSN2 by Schott is an obsolete optical glass. It transmits from 0.33 to 0.70 µm with an nd of 1.558361 and a Vd of 54.157173. It has low thermal expansion (CTE of 4.5×10⁻⁶/K), below average chemical resistance, high relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–1.06 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–1.06 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–0.700 µm
Optical Properties
Refractive Index (nd) 1.558361
Abbe Number (Vd) 54.157173
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 1.06 µm
$$n(\lambda) = \sqrt{1 + \frac{1.2617\,\lambda^2}{\lambda^2 - 0.0076742} + \frac{0.128881\,\lambda^2}{\lambda^2 - 0.033013} + \frac{0.898521\,\lambda^2}{\lambda^2 - 70.8271}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 4.5
TCE 100/300°C (10-6/K) 5.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.07 \times 10^{-6} + 2(1.41 \times 10^{-8})\,\Delta T + 3(-1.91 \times 10^{-11})\,\Delta T^2 + \frac{3.1 \times 10^{-7} + 2(4.28 \times 10^{-10})\,\Delta T}{\lambda - 0.251}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.56
Relative Cost 15.0
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 3
Stain Resistance 4
Acid Resistance 52
Alkali Resistance 4
Phosphate Resistance 4
Notes

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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
B48-53 Corning 1.547753 53.492251
BALF5 Sumita 1.54739 53.6
BAL5 Ohara 1.547393 53.550738
B58-53 Corning 1.557511 52.533062
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
N-KZFS2 Schott 1.55836 54.01
N-BALF5 Schott 1.54739 53.63
BALF5 Schott 1.547391 53.629486
N-BAK4HT Schott 1.56883 55.98
N-BAK4 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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