K3 by Sumita

Obsolete Very Rare Environmentally Dangerous

K3 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 1.51823 and a Vd of 59.0. 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) 1.51823
Abbe Number (Vd) 59.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.2697 - 0.00713349\,\lambda^2 + 0.0133143\,\lambda^{-2} - 0.000231818\,\lambda^{-4} + 5.61675 \times 10^{-5}\,\lambda^{-6} - 2.47853 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.6
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) 2.54
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
K3 Schott 1.51823 58.976559
NSL3 Ohara 1.518229 58.966406
C3 Hoya 1.518234 58.96082
E-C3 Hoya 1.51823 58.96
H-K10 CDGM 1.51818 58.949331
S-NSL3 Ohara 1.518229 58.902057
C5 Hoya 1.522488 59.447258
H-K51 CDGM 1.52307 58.639792
C12 Hoya 1.523073 58.640203
N-K5 Schott 1.52249 59.48
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K5 Sumita 1.52249 59.6
KN1 Sumita 1.524 59.3
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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