Aiflon Serrated Metallic Gasket is the preferred gasket when improved performance at low seating stresses is required. It features excellent anti-blow-out properties linked with the reliably of a solid metal-to-metal seal combined with a soft sealing face to provide a tighter joint.  It is particularly suitable for applications where high temperature, pressures and fluctuating conditions are encountered. Non-metal cover layers ensure that flanges are not damaged, even at extreme loads. This gasket is an ideal replacement for problem applications associated with jacketed gaskets, for heat exchangers, vessels and reactors and various flange connections. (Pressure: (6.4~25Mpa)

The thickness of graphite or PTFE face is normally 0.5mm.
Depending on centering ring with cheaper material (Normal: CS) and thinner thickness (Normal: 1.5mm) for Style 6400 SJ,  maybe it is more economical than 6400JR.

Serrated gasket with loose outer ring

Spiral Wound Gasket, Spiral wound gasket without inner and outer ring, Spiral wound gasket with inner ring, Spiral wound gasket with outer ring, Spiral wound gasket with inner and outer ring, SWG with bar used in heat exchanger, Spiral wound gasket with special shape, Metal Jacketed Gasket, Double jacket flat gasket, Double jacket corrugated gasket, Metal jacketed gasket with special shape, Metal Eyeleted Flat Gasket, Ring Joint Gasket, Metal flat gasket, Oval type metal gasket, Octagonal type metal gasket, RX type metal gasket, BX type metal gasket, PTFE Envelope Gasket, V type PTFE envelope gasket, U type PTFE envelope gasket, Square type PTFE envelope gasket, Corrugated Metal Gasket, Kamprofile gasket, Serrated gasket with outer ring, Serrated gasket with loose outer ring, Rubber gasket, Non-metallic gasket, PTFE gasket, Easy PTFE gasket, Braided Expanded Graphite tube, PTFE Thread Sealing Tape (with/without oil), Silicon Foam Tape (with self-adhesive)