RF (Raised Face) – The most widely used facing type in the market. Compatible with rubber, PTFE, and spiral-wound gaskets. Suitable for general-purpose service across most pressure and temperature ranges.
FF (Flat Face) – Designed with a full-face contact surface. Primarily used with low-pressure cast iron flanges to prevent flange distortion due to excessive bolt loading. Commonly applied in municipal water systems and low-pressure utility lines.
RTJ (Ring-Type Joint) – Features a precision-machined groove for accommodating metallic ring gaskets. Mandatory for high-pressure and high-temperature services (Class 900 and above). The preferred choice for large-bore hydrogen, high-temperature steam, and critical hydrocarbon lines where metal-to-metal sealing is required.
MFM (Male & Female Face) – Utilizes matched male and female mating surfaces. Effectively prevents gasket extrusion under high internal pressure. Recommended for aggressive corrosive media and erosive fluid services.
TG (Tongue & Groove Face) – Employs interlocking tongue-and-groove profiles. Offers excellent gasket retention and sealing stability. Ideally suited for severe service conditions involving strong corrosives, abrasive slurries, or cyclic thermal loading where gasket displacement must be minimized.
