K-CD180 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-CD180 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 2.00 µm with an nd of 1.80645 and a Vd of 24.4. It has medium thermal expansion (CTE of 8.6×10⁻⁶/K), excellent chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.000 µm
Optical Properties
Refractive Index (nd) 1.80645
Abbe Number (Vd) 24.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{3.11969 - 0.0136092\,\lambda^2 + 0.0430853\,\lambda^{-2} + 0.00321505\,\lambda^{-4} - 0.000247063\,\lambda^{-6} + 3.53764 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.6
TCE 100/300°C (10-6/K) 11.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.05 \times 10^{-6} + 2(6.42 \times 10^{-9})\,\Delta T + 3(-1.73 \times 10^{-10})\,\Delta T^2 + \frac{1.02 \times 10^{-6} + 2(1.63 \times 10^{-9})\,\Delta T}{\lambda - 0.295}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.17
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
SF6G05 Schott 1.80906 25.27
N-SF6HTultra Schott 1.80518 25.36
N-SF6 Schott 1.80518 25.36
N-SF6HT Schott 1.80518 25.36
ZF7 CDGM 1.806277 25.380144
SFL6 Schott 1.80518 25.39
S-TIH6 Ohara 1.805181 25.425363
SF6HT Schott 1.80518 25.43
SF6 Schott 1.80518 25.43
TIH6 Ohara 1.805181 25.432057
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SFLD60 Sumita 1.80645 24.4
SFLD66 Sumita 1.79925 24.6
K-SFLD66 Sumita 1.79925 24.6
SFLD6 Sumita 1.80518 25.4
K-SFLD6 Sumita 1.80518 25.4
K-CD180(M) Sumita 1.79912 24.7
SF6 Sumita 1.80518 25.5
SF6W Sumita 1.80518 25.5
SFLD20 Sumita 1.81786 23.7
SF11 Sumita 1.78472 25.7
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