Thermionics viewports are mounted in UHV stainless steel flanges in the sizes noted below. Useable to below 1 x 10-11 Torr. Polished window surfaces offer minimum distortion and provide maximum light transmission.
The custom viewports are available for special applications, i.e., special materials and/or optical properties.
| Model No. | Viewing Dia. | Nom. Flange Size | Flange O.D. | Bolt Circle Dia. | Flange Thickness | Glass Thickness | Ship Wt. |
| ZPV-075 | 0.625 | 1.33 | 1.33 | 1.062 | 0.285 | 0.062 | 1.0 |
| ZPV-100 | 0.625 | 2.12 | 2.12 | 1.625 | 0.470 | 0.062 | 1.0 |
| ZPV-150 | 1.40 | 2.75 | 2.75 | 2.312 | 0.625 | 0.105 | 1.0 |
| ZPV-200 | 1.40 | 3.37 | 3.37 | 2.850 | 0.625 | 0.105 | 2.0 |
| ZPV-250 | 2.69 | 4.50 | 4.5 | 3.628 | .0680 | 0.175 | 4.0 |
| ZPV-300 | 2.69 | 4.62 | 4.62 | 4.030 | 0.750 | 0.175 | 5.0 |
| ZPV-400 | 3.88 | 6.00 | 6.00 | 5.128 | 0.780 | 0.200 | 6.0 |
| ZPV-500 | 3.88 | 6.75 | 6.75 | 5.969 | 0.840 | 0.200 | 7.0 |
| ZPV-600 | 5.38 | 8.00 | 8.0 | 7.128 | 0.880 | 0.375 | 9.0 |
| ZPV-800 | 5.38 | 8.00 | 10.0 | 9.128 | 0.970 | 0.375 | 10.0 |