| What are the characteristics of different metal coating materials? |
| Metal Coating Type |
Reflective Band |
Reflectance@typical value |
Feature |
| Al |
UV |
85%@200nm |
High reflectivity in the UV band, but easy to oxidize, often with MgF? protective coating |
| VIS |
90% @500nm |
| NIR |
92% @1000nm |
| Ag |
VIS |
95% @500nm |
Highest reflectivity in visible, but easily vulcanized and blackened, need protective coating (e.g. SiO?) |
| MIR |
98% @2000nm |
| Au |
NIR |
98% @1000nm |
Excellent performance in the infrared, corrosion resistant, but strong absorption in the visible (yellow color) |
