Automatic Transmission Seals

Automatic Transmission Seals

High Performance, Extended Life Automatic Transmission Seals

Automatic transmission seals made using DuPontVamac® provide proven performance in modern vehicle drivetrains.

Many of today’s vehicle drivetrain systems are designed for reduced maintenance/zero maintenance. Transmissions must operate for the life of the manufacturer warranty with the factory filled fluid with no leakage and at high efficiencies.

Designed for the Long Run

Automatic transmission O-rings, D-rings, lip seals, fluid filter screen seals, fuel injector seals and other elastomeric components must provide the fluid resistance to retain physical properties for long-term performance at both high and low temperatures for the life expectancy of the vehicle.

The ability of Vamac® to form lasting bonds with plastic or metal  provides additional performance and criteria to help meet the longer manufacturer warranty times.

Other related automotive applications other than transmission sealing that use Vamac® are:

  • Engine seals such as rocker cover gaskets
  • Oil pan gaskets
  • Transmission oil cooler hose
  • Turbocharger hose
  • Turbocharger molded air ducts

A Material of Choice

OEM’s, drivetrain and engine designers, along with component suppliers,  are continuously working to reduce weight and increase  fuel efficiency, while obtaining more power from smaller turbocharged engines. 

That puts a premium on consistent quality and application-specific performance, and makes DuPont™ Vamac® ethylene acrylic elastomer (AEM) the material of choice. It’s specified for automatic transmission seals and other vital parts by large OEM suppliers, and by many OEM’s.

Grades Made to Match Applications                        

The Vamac® product line has  numerous grades and families that include standard grades (G, GLS, GXF and DP) and the Ultra family with improved performance for precision applications in injection or compression molding.

Vamac® compounds can also be extruded for hoses (transmission oil cooler hoses) and tubes.   

Resistance and Durability Tested

Vamac® polymers are a versatile family of ethylene acrylic elastomers (AEM), that deliver consistent, rubber-like flexibility over wide temperature ranges with good resistance to automatic transmission fluids, engine oils and acid condensates.

Vamac® also provides:

  • Good Compression Set and Good CSR (Compressive Stress Relaxation) properties.
  • Excellent toughness and abrasion resistance.
  • Good processability, for accurate seal dimensions and fit.

Support and Quality Worldwide

DuPont is a global automotive materials supplier, working locally with parts and vehicle makers in every region. DuPont is committed to the highest standards of quality and global supply, supported by regionally based innovation centers, technical support and manufacturing.

Vamac® comes with knowledgeable support, from material selection to end-use testing, across four continents. For global manufacturers, there’s also peace of mind in knowing that an automatic transmission seal tested in one region can be commercialized in another region.

*The Viton® fluoroelastomer business is now part of The Chemours Company.  Visit for more information.

*For information on Neoprene, contact