Choosing the right seal

Material Specifications

Material Properties Compatibility Application Temperature Range
Polyurethane (PU)
PU is the most popular polymer source used in hydraulic sealing systems. Its popularity in hydraulic sealing systems may be attributed to its high tensile strength and elastic properties.
Compatible with mineral oil, compressed air, and water
Hydraulic and other seal elements
-30 to 105°C
Low Temperature Polyurethane (LTPU)
LTPU is a hydrolysis resistant PU used in low temperature conditions and hot water applications.
Compatible with sea water, mineral oil, oxygen (cold), HFA fluids, and HFB fluids
Hydraulic and other seal elements
-50 to 105°C
Nitrile Rubber (NBR)
NBR is the most common elastomer used in hydraulic and pneumatic sealing systems. Its high wear resistance makes it ideal for use in rotary shaft and static sealing systems as well.
Compatible with mineral oil, compressed air, and water
Hydraulic, pneumatic, oilfield, rotary shaft oil seals, and O-rings
-25 to 100°C
Hydrogenated Acrylnitrile Butadiene Rubber (HNBR)
HNBR is often used where sour gas (H2S) and crude oils are present
Compatible with petroleum fluids, sour gas and mineral oil
Oilfield seals and O-rings
-30 to 150°C
Silicon (VMQ)
VMQ has a high lubricant absorbency with a very wide temperature capacity, offering the widest range of normal operating temperatures. It minimises wear and friction in certain applications.
Resistant to a number of chemicals and petroleum oils, not recommended for dynamic applications
Flange, static seals, and O-rings
-55 to 210°C
Ethylene Propylene Rubber (EPDM)
EPDM is suited for brake fluids, bases, acids and alcohols. It is often used in hot water steam applications, as well as in fire resistant fluids in the presence of synthetic oils.
Compatible with brake fluids in breaking systems
Hydraulic, pneumatic, oilfield, rotary shaft oil seals, and O-rings
-50 to 130°C
Viton (FKM)
FKM is a synthetic rubber with the ability to withstand high temperatures and large quantities of chemicals. They are also adapted for hard vacuum applications.
Compatible with transmission fluids, gasoline, and petroleum oils
Hydraulic, pneumatic, oilfield, rotary shaft oil seals, and O-rings
-20 to 210°C
Perfluoroelastomeric (FFKM)
FFKM an upgraded FKM material with a higher resistance to extreme temperatures and harsher chemicals.
Compatible with most chemicals; suited for use in harsh environments
O-rings
-10 to 325°C
Polyacetal (POM)
POM is a rigid thermoplastic with low friction and excellent dimension stability.
Poor resistance to strong acids, bases and oxidizing agents
Back-up rings, bushings, and wear rings
-60 to 100°C
Polyamides (PA)/Nylon
PA, more commonly known as Nylon, is a type of polymer used in many engineering applications.
More resistant to alkaline hydrolysis than polyesters but not as resistant to acid hydrolysis
Back-up rings, bushings, and wear rings
-30 to 105°C
Polytetrafluoroethylene (PTFE)/ Teflon
PTFE (Teflon) is a self-lubricating fluoropolymer commonly used in the engineering and food industries. Low friction, excellent thermal and chemical properties.
Compatible with most chemicals; has food-grade applications
Composite seals with elastomer preload elements, spring-energized seals, bushings, and wear rings
-200 to 260°C
Polyetheretherketone (PEEK)
PEEK is a high-performance thermoplastic with excellent physical and chemical properties to serve a wide range of applications at high temperatures.
Compatible with most chemicals
Back-up rings, bushings, and wear rings
-50 to 250°C