KF4 by Sumita

Obsolete Very Rare Environmentally Dangerous

KF4 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 1.53358 and a Vd of 51.6. 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) 1.53358
Abbe Number (Vd) 51.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.31386 - 0.00914083\,\lambda^2 + 0.0127498\,\lambda^{-2} + 0.000609799\,\lambda^{-4} - 4.60366 \times 10^{-5}\,\lambda^{-6} + 3.20224 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.6
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) 2.8
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
CF4 Hoya 1.533577 51.545117
KZFN2 Schott 1.52944 51.626811
SBF2 Hoya 1.52944 51.643052
SSL2 Ohara 1.529441 51.722557
B29-52 Corning 1.528998 51.838713
CF2 Hoya 1.526296 51.046045
N-KF9 Schott 1.52346 51.54
KF9 Schott 1.523412 51.492996
ADP Generic Birefringent 1.523454 52.25678
CF5 Hoya 1.5231 50.951831
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
KZF2 Sumita 1.52944 51.8
KF2 Sumita 1.5263 51.0
KF5 Sumita 1.5231 50.9
KF6 Sumita 1.51742 52.2
LLF6 Sumita 1.53172 48.9
BALF5 Sumita 1.54739 53.6
K-SKF6 Sumita 1.512 52.1
KF8 Sumita 1.51118 50.9
K-SKF6(M) Sumita 1.50847 52.6
KF3 Sumita 1.51454 54.6
Compare Glasses
    Compare Selected