Simrit's E454 EPDM (ethylene-propylene rubber) compound was recently certified to NAS (National Aerospace Standard) 1613 Revision 5 Specification. The certification, which establishes the requirements for elastomer seal elements used in hydraulic systems using phosphate ester fluids, applies to all commercially available phosphate ester hydraulic fluids. Simrit’s E454 black compound is intended for NAS-1611-XXXA and NAS-1612-YYA (A-code) series O-rings. Developed by Simrit in 2005, the E454 compound is applicable for the following applications: commercial aircraft hydraulic flight control units (primary and secondary); power units and pumps; and aircraft braking systems. Certification was achieved after a major manufacturer of flight control power units requested the material be tested to the NAS 1613 Specification. As a result, the material was tested on all type 5 fluids, making Simrit the only material supplier with this type of testing knowledge. The NAS 1613 specification covers elastomeric seals used in phosphate ester hydraulic fluids, which are widely used in aircraft for hydraulically boosted primary and secondary flight controls and hydraulic brake systems. For more information call (866) 274-6748 or visit www.simrit.com.