K11 by Sumita

Obsolete Very Rare Environmentally Dangerous

K11 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 1.50013 and a Vd of 61.6. 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) 1.50013
Abbe Number (Vd) 61.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.22117 - 0.00924182\,\lambda^2 + 0.0107297\,\lambda^{-2} + 0.000151968\,\lambda^{-4} + 2.47214 \times 10^{-6}\,\lambda^{-6} + 1.51095 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.6
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
K11 Schott 1.50013 61.438579
H-K1 CDGM 1.49967 62.071979
ZNC7 Hoya 1.508471 61.266087
K4A CDGM 1.50802 61.052897
N-ZK7 Schott 1.50847 61.19
ZKN7 Schott 1.508469 61.187789
N-ZK7A Schott 1.508054 61.04
AF32ECO Schott 1.511531 62.574031
NSL7 Ohara 1.511121 60.485793
C7 Hoya 1.511122 60.485929
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K7 Sumita 1.51112 60.5
BK1 Sumita 1.51009 63.4
K-PBK40(M) Sumita 1.51497 63.3
BALK3 Sumita 1.51835 60.3
K-PBK50(M) Sumita 1.52025 62.2
P-BK40 Sumita 1.5176 63.5
K-PBK40 Sumita 1.5176 63.5
K-PBK50 Sumita 1.5225 62.3
BK7 Sumita 1.51633 64.1
K-BK7 Sumita 1.51633 64.1
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