Varian Vacuum Conflat Flange 4.5″

A  stainless steel flange designed for ultra-high vacuum (UHV) and high vacuum (HV) systems. Originally developed by Varian, the ConFlat (CF) flange uses precision knife-edge sealing and copper gaskets to reliably achieve leak-tight performance down to 10⁻¹³ Torr m

📏 Key Specifications

• Outer Diameter (OD): 4.5″ (North American sizing) – equivalent to DN63CF

• Material: Type 304L or 304 ESR stainless steel (available in non-rotatable or rotatable versions)

• Vacuum Range: Atmospheric to ≤ 1×10⁻¹³ Torr (10⁻¹¹ Pa)

• Temperature Tolerance: −196 °C to +450 °C (limited by stainless steel and copper gasket capabilities)

🛠️ Seal & Assembly

• Utilizes a knife-edge design that indents a high-purity oxygen-free copper gasket, ensuring a metal-to-metal seal for leak-tight performance

• Flanges are “sexless”—identical and interchangeable—simplifying handling and inventory

➕ Additional Options

• Rotatable vs. Fixed bolt pattern: Rotatable options help ease alignment during assembly