By selecting the halogen source, one can achieve flame retardancy in certain plastics using synergists other than antimony oxide. Nylon 66 can be flame retarded using the chlorinated flame retardant CFR with the synergists antimony oxide, zinc oxide, zinc borate, ferric oxide, zinc stannate and zinc molybdate-magnesium silicate. By using mixed synergists, the levels of flame retardants needed can be lowered in nylon 66, nylon 6 and epoxies.PBT can be flame retarded using synergists other than antimony but, so far, in PET, antimony oxide has to be used as a synergist.
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