Asher Agency: Trelleborg Sealing Solutions launches a sealing material that gives unrivaled performance in phosphate ester hydraulic fluids

Trelleborg Sealing Solutions announces the introduction of EPDM E8T89 to its range of materials specifically engineered for aerospace applications. In tests this new EPDM compound exhibits good stability at elevated temperatures in all type IV and type V phosphate ester hydraulic fluids, known under the HyJet and Skydrol brands, as specified in NAS1613 Rev 5. With its excellent overall performance, it offers an unrivaled solution for extended seal life in hydraulic applications in aircraft, reducing maintenance, downtime and ultimately costs.

Based on Ethylene Propylene Diene Monomer (EPDM), E8T89 provides an outstanding combined level of performance across key sealing requirements, including stability in phosphate ester fluids, long-term compression set resistance, low temperature flexibility and resistance to permanent deformation.

Materials Development Manager at Trelleborg Sealing Solutions, Jon Cutler, says: “The requirements for seals and gaskets in HyJet and Skydrol applications are extremely demanding. Seals have to withstand high pressures along with wide temperature fluctuations, and we have specifically engineered this new EPDM to be best-in-class in these conditions. Extensive long-term testing has been successfully undertaken with results that are better than other sealing materials on the market.

“These included back-to-back tests against a leading competitive product that complies with NAS 1613 Rev 5 grade. Our material was significantly better in terms of low-temperature flexibility using the measure TR10 according to test method ASTM D1329. In many actuation systems, improved low-temperature elasticity provides greater sealing security. More than ever before aircraft are flying higher in colder regions, and E8T89 meets the -55 °C/ -65 °F target set by the industry for sealing materials.”

In addition, in immersion tests, rather than losing volume, the material demonstrated a controlled positive swell in HyJet and Skydrol fuels, improving sealing performance. This is particularly an advantage where there is a low level of compression and where the seal is acting as a Back-up Ring. As well, the material has a very low long-term compression set giving extended life.

Compliant with NAS 1613 Rev 5 and independently accredited by LRCCP in France to NFL 17-241B8, EPDM E8T89 has an operating temperature range of -55 °C to +135 °C/ -65 °F to +275 °F. Typical applications are primary and secondary flight controls, thrust reverser actuation systems, braking systems, general hydraulic and actuation systems. The material can be standardized across a number of applications, further lowering costs in reduced inventory management.

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Information about Trelleborg Sealing Solutions and Trelleborg Group

Trelleborg Sealing Solutions is one of the world’s leading developers, manufacturers and suppliers of precision seals. It supports its aerospace, industrial and automotive customers through over 20 production facilities and more than 40 marketing companies globally. Within its 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 TurconÒ, ZurconÒ, OrkotÒ, IsolastÒ, StepsealÒ and Wills RingsÒ. www.tss.trelleborg.com

Trelleborg is a global industrial group whose leading positions are based on advanced polymer technology and in-depth applications know-how. Trelleborg develops high-performance solutions that seal, damp and protect in demanding industrial environments. The Trelleborg Group has annual sales of about SEK 22 billion (EUR 2.4 billion, USD 3.3 billion) with about 15,500 employees in over 40 countries. The Group comprises three business areas: Trelleborg Sealing Solutions, Trelleborg Wheel Systems, and Trelleborg Engineered Systems. In addition, Trelleborg owns 50 percent of TrelleborgVibracoustic, a global leader within antivibration solutions for light and heavy vehicles, with annual sales of SEK 13 billion (EUR 1.4 billion, USD 2.0 billion) and about 8,000 employees in 17 countries. The Trelleborg share has been listed on the Stockholm Stock Exchange since 1964 and is listed on the NASDAQ OMX Nordic List, Large Cap. www.trelleborg.com (http://file:///Q:/Trelleborg/2012%20Sealing%20Solutions/Press%20Releases/www.trelleborg.com)

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