Elastomers In Automotive Shaft Seals

Common elastomer  or rubber mainly used , Seals are divided into categories according to the following parts:

Engine Part                 Past used : VMQ               Current : FKM    Future  : HNBR or FKM
Transmission Part       Past used : VMQ or P.A.   Current : EAM    Future  : FKM
Pinion Part                  Past used : NBR or P.A.    Current : FKM    Future  : FKM
Wheel Part                  Past used : NBR                Current : EAM    Future  : EAM
Steering Part               Past used : NBR                Current : FKM    Future  : HNBR
Bearing Part                Past used : NBR                Current : NBR    Future  : HNBR or NBR

Seal must withstand effect of oxidized oils and oil additive , surface hardening of fluoroelastomers. For oil seal ; Seal functional mode is under static and dynamic load .

Properties of seal that must be consider

• Dimensional stability
• Modulus
• Permanent Set resistance
• Abrasion resistance , dry and/or lubricated
• Resilience
• Tear Strength
• Tensile and Elongation properties
• Excellent oil resistance
• Good fuel resistance