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Ternary hybrids based on poly(ethylene oxide) (PEO)/silica (SiO2)/antioxidants (AO) were produced by the sol-gel method and evaluated as slow-release antidegradants for polyamide Nylon 6. An amount of 3-glycidyloxypropyltrimethoxysilane (GOTMS) was used to compatibilise the binary combination PEO-SiO2. The antioxidants evaluated were chosen from commercial sources representing both phenolic and amine classes of molecules. In particular the antioxidants evaluated in some depth were 3,5-di-tert-butyl-4-hydroxytoluene (BHT, the lowest molecular weight hindered phenol antioxidant), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate (Irganox 1076) (a higher molecular weight phenolic antioxidant), bis-(2,2,6,6-tetramethyl-4-piperidyl)-sebacate (Tinuvin 770, a sterically hindered secondary aliphatic amine stabiliser HAS), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD, an aromatic amine antioxidant).