EPDM Seal Material: E8T89

Outstanding Elasticity and Hydraulic Compatibility

Extensive testing has resulted in E8T89, a new Ethylene Propylene Diene Monomer (EPDM) seal material from Trelleborg Sealing Solutions.

It provides a unique combination of outstanding elasticity at -55 °C / -67 °F and unrivaled compatibility with all commercially available phosphate ester hydraulic fluids, ensuring long-term sealing performance in aerospace hydraulic applications.

Compliance and Applications

E8T89 is engineered to meet the wide range of specifications for hydraulic aircraft systems.

It demonstrates excellent long-term retention of mechanical properties and enables stock reduction through part number rationalization.

It complies with NAS 1613 Rev 5, NF L 17-241 41B8, and other relevant national and international standards.

The material is available in O-rings, gaskets, molded parts, and rubber-to-metal bonded components.

Perfluoroelastomer Seal Material: Isolast® J9577

Best-in-Class Thermal Stability

Isolast® J9577 is a perfluoroelastomer designed for aero engine seals.

It provides outstanding performance at high temperatures, offering best-in-class thermal stability even in aggressive High Thermal Stability (HTS) oils.

Operating Range and Compatibility

The material operates continuously from -20 °C / -4 °F to +325 °C / +617 °F and is compatible with virtually all media, including HTS oils.

Its performance is notable in terms of long-term compression set, making it ideal for high-temperature static applications.

Isolast® J9577 is available in standard profiles or custom designs and is part of Trelleborg's proprietary Isolast® range for aerospace, chemical processing, semiconductor, and oil & gas industries.

Lightweight Silicone Material: 12-205LD

Weight Reduction and Efficiency

12-205LD is an innovative lightweight silicone material for aerospace sealing applications, typically 20 % lighter than standard silicones.

It contributes to weight reduction, supporting the aerospace industry's goals of improved efficiency and environmental compliance.

Versatile Manufacturing

Engineered for ease of processing, 12-205LD can be manufactured into simple grommets or complex 3D composite seals.

It is suitable for both new-generation lightweight aircraft and retrofit seals for legacy aircraft.

Elastomer Seal Performance in SPK Fuel Applications

Importance of Fuel Composition

Trelleborg's studies highlight the importance of specifying elastomer materials for aerospace synthetic paraffinic kerosene (SPK) fuels.

Traditional NBR materials may shrink in SPK due to lack of aromatic hydrocarbons, whereas fluoroelastomer materials maintain performance.

Test Findings and Recommendations

Tests in Jet A-1, SPK, and Jet A-1/SPK blends show that adequate aromatic content prevents shrinkage of traditional NBR seals.

Aromatics induce controlled swell in seals, ensuring reliable performance.

Careful material selection is essential when SPKs are used in aerospace fuel systems.