KZFS50 by Sumita

Obsolete Very Rare Environmentally Dangerous

KZFS50 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.74 and a Vd of 31.7. It has average chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.74
Abbe Number (Vd) 31.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.9257 - 0.0112345\,\lambda^2 + 0.0329311\,\lambda^{-2} + 0.00122679\,\lambda^{-4} - 1.76646 \times 10^{-5}\,\lambda^{-6} + 7.37047 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 6.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.47
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BPH50 Ohara 1.739997 31.710001
ADF505 Hoya 1.739996 31.655919
S-NBH53 Ohara 1.737999 32.261312
BASF54 Schott 1.73627 32.149453
S-NBH53V Ohara 1.737999 32.32659
NBFD32 Hoya 1.73037 32.23
NBFD9 Hoya 1.756898 31.798532
LAF11A Schott 1.756927 31.702906
N-LAF7 Schott 1.7495 34.82
ADF455 Hoya 1.71852 33.456548
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAFN12 Sumita 1.7569 31.7
K-CD120 Sumita 1.7225 29.2
CD120 Sumita 1.7225 29.2
SF18 Sumita 1.72151 29.3
SF3 Sumita 1.74 28.2
LAF70 Sumita 1.7495 35.0
SFN1 Sumita 1.72022 29.3
SF10 Sumita 1.72825 28.3
SF10W Sumita 1.72825 28.3
K-SFLD1 Sumita 1.71736 29.5
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