MDC’s 12" Outer Diameter (304.8 mm) Conflat® (CF) flange, constructed from corrosion-resistant 304 stainless steel, is built for demanding ultrahigh vacuum (UHV) applications requiring thermal stability, mechanical strength, and leak-tight integrity. With a nominal designation of DN400CF, this flange offers a robust sealing solution for large-diameter vacuum systems.

Key Features

UHV Performance: Rated to 1x10⁻¹³ Torr (1.33×10⁻¹¹ Pa)
High Temperature Capability: Heat-tolerant up to 450°C (842°F)
Material: Precision-machined from 304 stainless steel for strength and corrosion resistance
Design Options: Available in rotatable and nonrotatable versions
Gasket Compatibility: Accepts standard OFE copper gaskets
Standard Interface: Compatible with Varian and Balzers Conflat® designs
Bolt Hole Options:
Through-hole flanges: 32 holes drilled to 0.332" (8.43 mm)
Tapped flanges: 32 holes threaded to 0.312-24 UNF

Applications

MDC’s 12" CF flange is ideally suited for large-diameter UHV systems used in semiconductor fabrication, thin-film deposition, vacuum metallurgy, space simulation, surface analysis, and fusion research. Its large sealing area, thermal endurance, and proven reliability make it a trusted choice in research laboratories, industrial vacuum systems, and aerospace test environments where performance under extreme vacuum and temperature conditions is essential.