H-KF6 by CDGM

Preferred Medium Environmentally Friendly

H-KF6 by CDGM is a preferred optical glass with a medium melt frequency. It transmits from 0.34 to 2.40 µm with an nd of 1.51742 and a Vd of 52.149249. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.51742
Abbe Number (Vd) 52.149249
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.0736996\,\lambda^2}{\lambda^2 - 0.0478549} + \frac{1.19277\,\lambda^2}{\lambda^2 - 0.00781133} + \frac{1.01749\,\lambda^2}{\lambda^2 - 104.242}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) 0.898
Heat Capacity (J/gK) 0.69
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.94 \times 10^{-7} + 2(1.77 \times 10^{-8})\,\Delta T + 3(-1.13 \times 10^{-10})\,\Delta T^2 + \frac{5.53 \times 10^{-7} + 2(9.82 \times 10^{-10})\,\Delta T}{\lambda - 0.212}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.47
Relative Cost 3.6
Mechanical Properties
Young's Modulus (GPa) 66.26
Poisson's Ratio 0.222
Knoop Hardness (kgf/mm²) 456.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
E-CF6 Hoya 1.51742 52.15
CF6 Hoya 1.517419 52.154512
KF6 Sumita 1.51742 52.2
KF6 Schott 1.517421 52.200088
NSL36 Ohara 1.517417 52.412251
S-NSL36 Ohara 1.517417 52.430903
SSL5 Ohara 1.521299 52.553447
K-SKF6 Sumita 1.512 52.1
SBF5 Hoya 1.521299 52.780677
ADP Generic Birefringent 1.523454 52.25678
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-QF6A CDGM 1.53172 48.839833
QF6 CDGM 1.531719 48.755584
H-K12 CDGM 1.533589 55.469983
H-K8 CDGM 1.51602 56.794825
QF70GFI CDGM 1.547 48.161896
H-QF8 CDGM 1.54072 47.230007
QF8 CDGM 1.540718 47.198243
H-K51 CDGM 1.52307 58.639792
H-K10 CDGM 1.51818 58.949331
H-K50 CDGM 1.52249 59.480754
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