KF9 by Schott

Obsolete Unknown Environmentally Dangerous

KF9 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.523412 and a Vd of 51.492996. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K), excellent chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.523412
Abbe Number (Vd) 51.492996
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.16422\,\lambda^2}{\lambda^2 - 0.00787954} + \frac{0.118007\,\lambda^2}{\lambda^2 - 0.037252} + \frac{0.923055\,\lambda^2}{\lambda^2 - 109.925}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 7.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.13 \times 10^{-6} + 2(1.4 \times 10^{-8})\,\Delta T + 3(-2.12 \times 10^{-11})\,\Delta T^2 + \frac{6.25 \times 10^{-7} + 2(6.96 \times 10^{-10})\,\Delta T}{\lambda - 0.2}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.71
Relative Cost 1.95
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
CF5 Hoya 1.5231 50.951831
CF2 Hoya 1.526296 51.046045
KF5 Sumita 1.5231 50.9
KF2 Sumita 1.5263 51.0
ADP Generic Birefringent 1.523454 52.25678
SBF2 Hoya 1.52944 51.643052
B29-52 Corning 1.528998 51.838713
SSL2 Ohara 1.529441 51.722557
KZF2 Sumita 1.52944 51.8
H-KF6 CDGM 1.51742 52.149249
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-KF9 Schott 1.52346 51.54
KZFN2 Schott 1.52944 51.626811
KF6 Schott 1.517421 52.200088
LLF6HT Schott 1.531739 48.974492
N-LLF6 Schott 1.531688 48.895238
LLF6 Schott 1.531719 48.762595
D263TECO Schott 1.523303 54.5172
KF3 Schott 1.51454 54.702547
BALF5 Schott 1.547391 53.629486
N-BALF5 Schott 1.54739 53.63
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