K7HT by Schott

Obsolete Unknown Environmentally Dangerous

K7HT by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.511144 and a Vd of 60.466081. It has medium thermal expansion (CTE of 8.4×10⁻⁶/K), good chemical resistance, 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) 1.511144
Abbe Number (Vd) 60.466081
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.10108\,\lambda^2}{\lambda^2 - 0.00687551} + \frac{0.15087\,\lambda^2}{\lambda^2 - 0.0256582} + \frac{0.902837\,\lambda^2}{\lambda^2 - 108.518}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 9.7
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) 2.53
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 3
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 2
Notes

old, High UV Transmission; glass data moved from former "I_LINE" catalog

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-K6 CDGM 1.511125 60.478905
NSL7 Ohara 1.511121 60.485793
C7 Hoya 1.511122 60.485929
K7 Sumita 1.51112 60.5
B11-60 Corning 1.510999 60.383147
H-K7 CDGM 1.51478 60.634896
K4A CDGM 1.50802 61.052897
ZNC7 Hoya 1.508471 61.266087
B18-60 Corning 1.518201 60.291781
BACL3 Hoya 1.518351 60.396486
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
K7 Schott 1.51112 60.41
N-ZK7A Schott 1.508054 61.04
ZKN7 Schott 1.508469 61.187789
N-ZK7 Schott 1.50847 61.19
BALKN3 Schott 1.518489 60.259571
UK50 Schott 1.522571 60.383109
K50 Schott 1.522572 60.179756
K3 Schott 1.51823 58.976559
K11 Schott 1.50013 61.438579
K5HT Schott 1.522453 59.530889
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