ROYCO 44 is a heavy-duty antiseize compound developed for use on aircraft engine spark plugs, igniters, and threaded fasteners and fittings. ROYCO 44 has a consistency similar to modelling clay and is black in color.
Due to the graphite compound in ROYCO 44, this material should not be used in contact with aluminum, magnesium, cadmium, or zinc alloys and platings without prior evaluation. Because ROYCO 44 conducts electricity readily, the mating of dissimilar alloys, which may create an electrical potential, should be avoided.
ROYCO 44 meets the requirements and is qualified to the latest revision level of SAE-AMS-2518, which supersedes and replaces MIL-SPEC: MIL-T-5544.