K5HT by Schott

Obsolete Unknown Environmentally Dangerous

K5HT by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.522453 and a Vd of 59.530889. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), excellent 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) 1.522453
Abbe Number (Vd) 59.530889
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.05012\,\lambda^2}{\lambda^2 - 0.00629131} + \frac{0.234497\,\lambda^2}{\lambda^2 - 0.0228648} + \frac{0.912692\,\lambda^2}{\lambda^2 - 109.625}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.6
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) 2.59
Relative Cost —
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

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

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-K50 CDGM 1.52249 59.480754
K5 Sumita 1.52249 59.6
C5 Hoya 1.522488 59.447258
B23-59 Corning 1.522996 59.479482
NSL5 Ohara 1.522494 59.790926
S-NSL5 Ohara 1.522494 59.835417
KN1 Sumita 1.524 59.3
K3 Sumita 1.51823 59.0
BACL1 Hoya 1.526417 60.113677
NSL3 Ohara 1.518229 58.966406
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
K5 Schott 1.522489 59.482671
N-K5 Schott 1.52249 59.48
K50 Schott 1.522572 60.179756
K3 Schott 1.51823 58.976559
UK50 Schott 1.522571 60.383109
BALKN3 Schott 1.518489 60.259571
B270 Schott 1.52308 58.571369
K7 Schott 1.51112 60.41
K7HT Schott 1.511144 60.466081
ZK1 Schott 1.533149 57.980912
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