Understanding the Standards
KF (Klein Flansch/Quick Flange):
These use an O-ring and a single clamp for sealing, allowing for quick assembly and disassembly. They are used for rough to high vacuum applications, typically up to 10⁻⁷ mbar. Standard sizes are in nominal diameters (DN) from 10 to 50 mm (e.g., KF16, KF25, KF40).
ISO:
Similar to KF, ISO flanges also use an O-ring seal, but for larger diameter piping, ranging from DN 63 to DN 320. They are suited for high vacuum applications in industry and research.
CF (ConFlat):
These utilize a captured copper gasket and are designed for ultra-high vacuum (UHV) and extremely high vacuum (XHV) applications, capable of reaching 10⁻¹¹ mbar or lower. They can also be baked to higher temperatures (up to 200°C sustained).
Available KF / CF / ISO Vacuum Components
A wide array of components are available across all three standards, typically in materials like 304 or 316L stainless steel and aluminium.
Flanges:
Various options including blank flanges, bored flanges, and adapter flanges (e.g., CF to KF adapters).
Fittings and Adapters:
This includes elbows (90° bends), tees, 4-way and 6-way crosses, reducers, and weld stubs.
Hoses and Bellows:
Flexible components made of corrugated stainless steel are available in all ranges.
Valves:
Specific vacuum valves are manufactured with KF, ISO, and CF terminations, including ball valves and angle valves.
Accessories:
Essential accessories like clamps, centering rings (with O-rings), and copper gaskets (for CF) are readily available