KF80 Vacuum Viewport — KF80 Sight Glass for High Vacuum
KF80 vacuum sight glass (ISO-KF80) for high-vacuum systems. Available in borosilicate, fused silica and sapphire. Compact, quick-install KF flange, optional AR coatings and custom sizes.
Description
KF80 Vacuum Sight Glass (KF80 Viewport) — Compact High-Vacuum Optical Port
KF-80 is an ISO-KF (NW80) flanged viewport engineered for high-vacuum observation, alignment and process monitoring. Materials: borosilicate, fused silica (quartz), sapphire and infrared crystals — chosen by wavelength, temperature and process demands.
Key benefits
- KF80 flange — compatible with standard KF clamps, centering rings & O-rings for fast install/remove.
- High-vacuum sealing — Viton O-rings or metal gasket options for low leak rate and repeatable performance.
- Material flexibility — borosilicate, fused silica (for UV), sapphire (high T & mech), CaF2, ZnSe (IR).
- Compact & modular — ideal for diagnostic ports, laser access and small chambers.
Quick specs
Visible aperture: 80 mm · Outer Ø: 114 mm · Glass thickness: 6 mm · Product height: 49 mm.
Technical specifications
| Product model | KF-80 |
|---|---|
| Vacuum rating (typ.) | Leak rate typical: ~1×10⁻¹² Pa·m³/s (depends on sealing option) |
| Flange material | Stainless steel 304 (other grades available) |
| Window materials | Borosilicate · Fused silica (quartz) · Sapphire · BaF₂ · CaF₂ · ZnSe — select by wavelength & bakeout needs |
| Surface quality / flatness | Surface quality: 60/40, 50/20, 20/10 · Optical figure: 1/2 → 1/10 (grade dependent) |
| Visible aperture (mm) | Ø 80 mm (standard; custom apertures on request) |
| Outer / inner diameter | Outer Ø 114 mm · Inner Ø 80 mm |
| Product height & glass thickness | Product height 49 mm · Glass thickness 6 mm |
| Heat resistance (typ.) | ~150–230 °C (material dependent — sapphire/quartz permits higher bakeout temps) |
Applications & industries
- Semiconductor equipment — process monitoring & plasma observation.
- Vacuum coating and thin-film deposition systems.
- Laboratory and R&D vacuum chambers.
- Laser alignment, spectroscopy and optical diagnostics in vacuum.
- Analytical instruments requiring optical access to high-vacuum environments.
FAQ — KF80 viewport
Which material is best for deep-UV?
Fused silica (quartz) is the preferred choice for deep-UV (down to ~180 nm). Borosilicate has limited deep-UV transmission; sapphire is robust but not ideal for the deepest UV bands.
Can I order custom diameters and high flatness?
Yes — custom diameters, thicknesses, and optical grades (e.g., 20/10 surface, 1/10 wave flatness) are available. CAD drawings and small batch fabrication are supported.
