Aerospace Standard (NAS) 1613 Revision 5 Specification.
The certification, which establishes the specifications for elastomer seal elements that are used in hydraulic systems using phosphate ester fluids, applies to all commercially available phosphate ester hydraulic fluids.
The firm'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 compound is used in the following applications: commercial aircraft hydraulic flight-control units (primary and secondary); power units and pumps; and aircraft braking systems.
According to the company, certification was achieved after a major manufacturer of flight-control power units asked for the material to be tested to the NAS 1613 Specification. As a result, it was tested on all type 5 fluids.
'Our latest certification highlights Simrit's dedication to developing and manufacturing sealing materials that meet our customers' and the aerospace industries' demanding needs,' said Dr Robert Keller, Materials Development Manager, Simrit.
'In the case of our E454 compound, the material's test results were one of the key reasons a leading aerospace manufacturer chose to work with us.'
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.
The seals involved are especially critical, since leakage of the phosphate ester hydraulic fluid is flight safety critical for hydraulic controls in all stages of an aircraft's operationtaxi, take-off, climb, cruise, descent, landing and braking.
The NAS-1613 specification is one of the most rigorous and extensive in the sealing industry, says Simrit. It was written to assure long-term seal performance through a wide temperature range -from the frigid air of high-altitude cruise flight to the extremely high temperatures experienced by anti-lock braking during landing.