The materials of spring energized seal

PTFE is the most commonly used sealing ring material, with excellent physical and chemical properties, moderate cost and good mechanical properties.

By using different fillers, the properties of PTFE compounds can be further improved to improve sealing efficiency (such as tensile strength, wear resistance, etc.).  However, not all fillers can be increased indefinitely, the filler content is usually 5% to 40%.

Commonly used filling materials from Forever Seals.
Bronze
Carbon/Carbon Fibre
Glass Fibre
Graphite
Molybdenum disulfide (Mos2)...
For filling materials under special conditions, please consult Forever Seals for details.

PTFE compound material advantages:

Extremely wide temperature tolerance

Temperature cycle resistance

Low friction coefficient

High resistance to wear

Dry running capacity

The PV factor

It's resistant to almost every known chemical and solvent

No chemical swelling when exposed to moisture or fluid