KF3 by Sumita

Obsolete Very Rare Environmentally Dangerous

KF3 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.30 to 2.00 µm with an nd of 1.51454 and a Vd of 54.6. It has good 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: 0.300–2.000 µm
Optical Properties
Refractive Index (nd) 1.51454
Abbe Number (Vd) 54.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.25951 - 0.00870179\,\lambda^2 + 0.0116919\,\lambda^{-2} + 0.000507518\,\lambda^{-4} - 4.08958 \times 10^{-5}\,\lambda^{-6} + 2.68012 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.7
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) 2.61
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
CF3 Hoya 1.51454 54.628437
KF3 Schott 1.51454 54.702547
NSL33 Ohara 1.514536 54.714595
D263TECO Schott 1.523303 54.5172
KDP Generic Birefringent 1.509182 56.224997
SBF5 Hoya 1.521299 52.780677
C2 Hoya 1.51602 56.771193
S-NSL36 Ohara 1.517417 52.430903
H-K8 CDGM 1.51602 56.794825
NSL2 Ohara 1.516016 56.800755
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SKF6(M) Sumita 1.50847 52.6
KF6 Sumita 1.51742 52.2
K-SKF6 Sumita 1.512 52.1
KZF2 Sumita 1.52944 51.8
KF8 Sumita 1.51118 50.9
KF5 Sumita 1.5231 50.9
KF2 Sumita 1.5263 51.0
KF4 Sumita 1.53358 51.6
K3 Sumita 1.51823 59.0
BALF5 Sumita 1.54739 53.6
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