K5 by Sumita

Obsolete Very Rare Environmentally Dangerous

K5 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 1.52249 and a Vd of 59.6. It has excellent 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) 1.52249
Abbe Number (Vd) 59.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.28431 - 0.008201\,\lambda^2 + 0.012335\,\lambda^{-2} + 3.99153 \times 10^{-5}\,\lambda^{-4} + 2.0074 \times 10^{-5}\,\lambda^{-6} - 7.39979 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.8
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) 2.6
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K5HT Schott 1.522453 59.530889
K5 Schott 1.522489 59.482671
H-K50 CDGM 1.52249 59.480754
N-K5 Schott 1.52249 59.48
B23-59 Corning 1.522996 59.479482
C5 Hoya 1.522488 59.447258
NSL5 Ohara 1.522494 59.790926
S-NSL5 Ohara 1.522494 59.835417
K50 Schott 1.522572 60.179756
BACL1 Hoya 1.526417 60.113677
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
KN1 Sumita 1.524 59.3
K3 Sumita 1.51823 59.0
BALK3 Sumita 1.51835 60.3
K7 Sumita 1.51112 60.5
BAK2 Sumita 1.53996 59.7
K-PBK60(M) Sumita 1.52483 62.0
K-PBK50(M) Sumita 1.52025 62.2
K-PBK50 Sumita 1.5225 62.3
K-PBK60 Sumita 1.5274 62.3
K11 Sumita 1.50013 61.6
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