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Trelleborg Introduces Flexible, Thermal-resistant & Lightweight Sealing Materials for Aerospace Industry

SpecialChem / Jun 21, 2011

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
    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 company's 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.

Compatible with hydraulic fuels

The material also ensures long life as it demonstrates compatibility with demanding phosphate ester hydraulic fluids, such as Hyjet and Skydrol®. In particular, it stands up to potential interchange between different hydraulic fluids during maintenance. In addition, E8T89 provides excellent long-term retention of mechanical properties and facilitates opportunities for stock reduction through part number rationalization.

EPDM E8T89 offers compliance with NAS 1613 Rev 5, NF L 17-241 41B8 and all other relevant national and international standards. It is available in all O-Ring sizes, as gaskets, molded parts or rubber-to-metal bonded components. Trelleborg Sealing Solutions launches Isolast® J9577, a perfluoroelastomer specifically engineered for aero engine seals. The material gives outstanding performance at high temperatures, offering best-in-class thermal stability, even in aggressive HTS oils, to provide extended seal life.

Compatible with HTS oils

Isolast® J9577 has a continuous operating temperature range from -20°C/ -4°F to +325°C/ +617°F and is compatible with virtually all media including aggressive High Thermal Stability (HTS) oils.

Perfluoroelastomer
Isolast® J9577

In a variety of tests to national and international standards as well as various customer specifications, the material demonstrated a step change in operating performance, most notably in terms of long term compression set."Thermal stability of sealing materials has become an increasingly important issue over recent years," says Paul Jones, Global Segment Manager Aero Engines, Trelleborg Sealing Solutions.

"With the drive to improve efficiency and meet environmental needs, aero engines run at higher temperatures to reduce fuel burn, decreasing CO2 emissions and lowering operator costs. For these applications, Isolast® J9577 is the ideal sealing material choice with its outstanding high temperature performance and proven best-in-class thermal stability."

Part of Isolast® range

Isolast® J9577 is recommended for use in static applications and is available in standard profiles or custom designs. The material is part of the Isolast® range of proprietary perfluoroelastomers from Trelleborg Sealing Solutions. In addition to this material the range includes a number of compounds specifically engineered for the requirements of the aerospace, chemical processing, semiconductor fabrication and oil & gas industries.

Trelleborg Sealing Solutions launches 12-205LD, an innovative lightweight silicone material specifically designed for aerospace sealing applications. Typically 20 percent lighter than standard silicones used for aerospace seals, the material contributes to weight reduction and the aerospace industry's drive to improve efficiency and meet environmental needs.

20 percent lighter

Silicone
20 Percent Lighter Silicone

"Lightweight compounds, such as 12-205LD, will increasingly become the materials of choice for aircraft manufacturers," says Duane Smith, Technical Manager for Trelleborg Sealing Solutions Global Operations Elastomers at Cadley Hill, England the primary site where the material will be used in manufacturing. "This development demonstrates Trelleborg's commitment to create innovations that meet aerospace industry needs."

Engineered with ease of processing in mind, 12-205LD can be manufactured as a wide range of components; from simple solid rubber grommets to highly complex three dimensional composite seals. The material is formulated to meet industry specifications and can be utilized on both new generation lightweight aircraft as well as for retrofit seals supplied to legacy aircraft.

A study conducted by Trelleborg Sealing Solutions shows that care must be taken when specifying elastomer seal materials in aerospace synthetic paraffinic kerosene (SPK) fuel applications. While the latest FKMs engineered for aero engines perform well in any SPK even in its neat form, there could be a risk of leakage if more traditional NBR materials are used in fuel applications as SPK has no aromatic hydrocarbon content.

About Trelleborg Sealing Solutions

Founded in the early 1950s, Trelleborg Sealing Solutions is one of the world's leading developers, manufacturers and suppliers of precision seals and bearings, providing the best in elastomer, thermoplastic, PTFE and composite technologies. Within their portfolio are some of the longest established sealing brands, including Busak+Shamban, Chase Walton, Dowty, Forsheda, GNL, Palmer Chenard, Shamban, Skega and Stefa along with a large number of proprietary products and materials such as Turcon®, Zurcon®, Orkot®, Isolast® , Stepseal® and Wills Rings®.

Source: Trelleborg Sealing Solutions


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