Spring Energized Seals

Choosing the Right Spring and Seal Jacket Materials for High-Temperature and Corrosive Fluid Applications

June 07. 2024

Spring energized seals have been widely used in harsh working conditions such as extreme operating temperatures, high pressure, corrosive chemical media, low friction, and high operating speeds. The main materials for seal Jackets aremodified PTFE and other high-performance plastics.

PTFE is a sealing material with superior chemical resistance and good heat resistance compared to perfluorinated rubber. It can be applied to the vast majority of chemical fluid solvents, hydraulic oils, and lubricants. Its compression set is very small, so it can provide long-term sealing performance. Spring energized seals use various special springs to overcome the elastic problems of PTFE or other high-performance Plastics.

JST has developed sealing components that can replace the vast majority of applications in static or dynamic (reciprocating or rotating). The temperature range can be from -196℃to 300℃, the pressure can range from vacuum to ultra-high pressure of 20MPa, with a movement speed up to 20m/s. Springs can be selected from different materials based on different application environments, making them suitable for various high-temperature corrosive fluids.

Common seal jacket material

Material code	Material	Color	Temp Range℃	Wear resistance	Main Application
P	Virgin PTFE	White	-196~200	1	Static, vacuum, refrigerant.
C	PTFE+Graphite	Black	-70~250	8	Medium load oil pressure, air pressure, emulsified oil, sea water.
G	PTFE+Carbon fibre	Black	-70~250	8	Especially suitable for water.
D	PTFE+Glass fibre	Black	-70~250	8	Suitable for strong acid and strong oxidant environments.
T	PTFE+Bronze	Green or Brown	-50~220	3	Medium and high load hydraulic components, high side load.
E	UPE	translucent	-196~80	10	Excellent wear resistance, especially suitable for low temperature applications.
K	PEEK	Light yellow	-196~260	11	Suitable for ultra-high pressure and related harsh environments.
F	PCTFE	translucent	-196~150	7	Cold flow resistance, abrasion resistance and dimensional stability.

Spring material introduction

Spring Material	Description
301/302 SS	The standard spring material of the spring energized seals can be used in oil, grease, air, water, water-based gas, food, medicine and other media conditions.
316 SS	Compared with 301 stainless steel, 316 stainless steel has significantly higher corrosion resistance and high temperature strength, and has a certain ability to resist oxidation erosion.
Hastelloy C-276	Widely used in corrosive media, such as acids, corrosives, seawater, etc.
Elgiloy	NACE-approved, excellent corrosion resistance and fatigue resistance:suitable for crude oil and sour natural gas media.
Inconel 718	It has high strength, good initial properties, and good corrosion resistance under high and low temperature conditions. Can be used in petrochemical industry and corrosive media, and can replace some Elgiloy applications.

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