K-CD120 by Sumita
Standard
Medium
Precision Molding
Environmentally Friendly
K-CD120 by Sumita is a standard optical glass with a medium melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.7225 and a Vd of 29.2. It has medium thermal expansion (CTE of 9.2×10⁻⁶/K), excellent chemical resistance, and precision molding compatibility.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 9.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 11.9 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.82 \times 10^{-6} + 2(1.79 \times 10^{-8})\,\Delta T + 3(-2.28 \times 10^{-10})\,\Delta T^2 + \frac{9.05 \times 10^{-7} + 2(2.82 \times 10^{-10})\,\Delta T}{\lambda - 0.28}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| P-SF69 | Schott | 1.7225 | 29.23 | |
| S-TIH18 | Ohara | 1.721507 | 29.23233 | |
| FD18 | Hoya | 1.721507 | 29.243436 | |
| PBH18 | Ohara | 1.721506 | 29.243262 | |
| SF18 | Schott | 1.72151 | 29.245495 | |
| FD20 | Hoya | 1.720225 | 29.300359 | |
| D17-29 | Corning | 1.717409 | 29.492751 | |
| H-ZF3 | CDGM | 1.71736 | 29.49911 | |
| E-FD1L | Hoya | 1.71736 | 29.5 | |
| E-FD1 | Hoya | 1.71736 | 29.5 |