| Thickness: | 3.0mm ±0.5mm |
| Size Tolerance: | +0.0mm/-0.5mm |
| Min. Clear Aperture: | 95% of outside dimension |
| Substrate Material: | Borosilicate glass |
| Flatness: | 5–10 waves per 25mm |
| Parallelism: | 3 arc minutes or better |
| Surface Quality: | 80/50 per MIL-O-13830 |
| Humidity and Abrasion: | Per MIL-C-67** |
| Max. Operating Temperature: | +200°C |
| Mechanical: | Unmounted |
| DESCRIPTION | PART NO. |
| Cold Mirror, 25mm diameter x 3mm thick | 645FK84-25 |
| Cold Mirror, 50mm diameter x 3mm thick | 645FK84-50 |
| Cold Mirror, 50mm x 50mm x 3mm thick | 645FK84-50S |
| Thickness: | 3.0mm ±0.5mm |
| Size Tolerance: | +0.0mm/-0.5mm |
| Min. Clear Aperture: | 95% of outside dimension |
| Substrate Material: | Borosilicate glass |
| Flatness: | 5–10 waves per 25mm |
| Parallelism: | 3 arc minutes or better |
| Surface Quality: | 80/50 per MIL-O-13830 |
| Humidity and Abrasion: | Per MIL-C-67** |
| Max. Operating Temperature: | +200°C |
| Mechanical: | Unmounted |
| DESCRIPTION | PART NO. |
| Hot Mirror, 512mm diameter x 3mm thick | 775FW82-12.5 |
| Hot Mirror, 25mm diameter x 3mm thick | 775FW82-25 |
| Hot Mirror, 50mm diameter x 3mm thick | 775FW82-50 |
| Hot Mirror, 50mm x 50mm x 3mm thick | 775FW82-50S |
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