Sealing material developments from Trelleborg Sealing Solutions include an EPDM that provides a unique combination of outstanding elasticity with unrivaled compatibility in hydraulic fluids, a perfluoroelastomer that offers best-in-class thermal stability and an innovative lightweight silicone material.

EPDM Seal Material

• E8T89 Ethylene Propylene Diene Monomer (EPDM) seal material provides a unique combination of outstanding elasticity at low temperatures with unrivaled compatibility in all commercially available phosphate ester hydraulic fluids.
  
• Perfluoroelastomer Isolast J9577 gives outstanding performance at high temperatures, offering best-in-class thermal stability, even in aggressive HTS oils.
  
• 12-205LD, an innovative lightweight silicone material, is typically 20 percent lighter than standard silicones used for aerospace seals.

Extensive testing has resulted in E8T89, a new Ethylene Propylene Diene Monomer (EPDM) seal material from Trelleborg Sealing Solutions. According to the companys research and development team it offers the best of everything that an aircraft operator could require of a sealing material for aerospace hydraulic applications. Specifically it provides a unique combination of outstanding elasticity at -55 °C/ -67 °F with unrivalled compatibility in all commercially available phosphate ester hydraulic fluids, ensuring extended long-term sealing performance.

Hydraulic sealing

"E8T89 is engineered to conform with the wide range of specifications that apply to hydraulic aircraft systems," says Guy Burridge, Product Manager, Trelleborg Sealing Solutions, Tewkesbury. "Because the material is compliant with all parts of these standards relating to seals, our tests have shown that this EPDM performs better on key criteria than any other material of its type on the market."

Importantly, E8T89 meets the requirement for low temperature performance that has become more significant in aerospace hydraulic applications. Most standards now demand materials that operate effectively at an extremely low limit of -55 °C/ -67 °F, in-line with minimum temperatures faced at high altitudes.