K-VC91(M) by Sumita
Standard
Rare
Environmentally Friendly
K-VC91(M) by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.88175 and a Vd of 34.9. It has medium thermal expansion (CTE of 7.7×10⁻⁶/K) and excellent chemical resistance.
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) | 7.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.08 \times 10^{-6} + 2(1.12 \times 10^{-8})\,\Delta T + 3(-9.02 \times 10^{-11})\,\Delta T^2 + \frac{8.61 \times 10^{-7} + 2(1.32 \times 10^{-9})\,\Delta T}{\lambda - 0.245}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| LAH75 | Ohara | 1.873996 | 35.258591 | |
| S-LAH75 | Ohara | 1.873996 | 35.258594 | |
| MC-TAFD317 | Hoya | 1.8812 | 37.17 | |
| D-ZLAF67-25 | CDGM | 1.88259 | 37.185491 | |
| D-ZLAF67 | CDGM | 1.88385 | 37.198899 | |
| M-TAFD307 | Hoya | 1.88202 | 37.22 | |
| MP-TAFD307 | Hoya | 1.88202 | 37.22 | |
| MC-TAFD307 | Hoya | 1.88202 | 37.22 | |
| S-LAH92 | Ohara | 1.891899 | 37.134024 | |
| S-LAH93 | Ohara | 1.90525 | 35.036826 |