KF8 by Sumita

Obsolete Very Rare Environmentally Dangerous

KF8 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.51118 and a Vd of 50.9. 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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.51118
Abbe Number (Vd) 50.9
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.2478 - 0.00922632\,\lambda^2 + 0.0121223\,\lambda^{-2} + 0.00056587\,\lambda^{-4} - 4.4856 \times 10^{-5}\,\lambda^{-6} + 4.09051 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.1
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) 2.46
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FTL8 Ohara 1.511179 51.020607
FF1 Hoya 1.511179 51.02769
H-KF6 CDGM 1.51742 52.149249
E-CF6 Hoya 1.51742 52.15
CF6 Hoya 1.517419 52.154512
KF6 Schott 1.517421 52.200088
CF5 Hoya 1.5231 50.951831
NSL36 Ohara 1.517417 52.412251
S-NSL36 Ohara 1.517417 52.430903
KF9 Schott 1.523412 51.492996
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SKF6 Sumita 1.512 52.1
KF6 Sumita 1.51742 52.2
KF5 Sumita 1.5231 50.9
K-SKF6(M) Sumita 1.50847 52.6
KF2 Sumita 1.5263 51.0
KZF2 Sumita 1.52944 51.8
KF4 Sumita 1.53358 51.6
LLF6 Sumita 1.53172 48.9
KF3 Sumita 1.51454 54.6
LLF2 Sumita 1.54072 47.2
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