K3 by Sumita

Obsolete Very Rare Environmentally Dangerous
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
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
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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