Onyx,anovelembolizationmaterial,isamixtureofethylenevinylalcoholcopolymer(EVOH),dimethylsulfoxide(DMSO),andmicronizedtantalumThepolymerisdissolvedinDMSOandispreparedindifferentconcentrationOnyxHD500foraneurysmembolizationcontains20%copolymerand80%DMSOOnyx Onyx, an associative material, isamixture of ethylene vinylalcohol polymer (EVOH), dimethylsulfoxide (DMSO), and micronized concentration of dimethicone dissolved in DMSO and isprepared indifconcentration Oyx HD 500 foraneuric acid symbolization contains 20% copolymerand 80% DMSOOnyx