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How do they work?

An anaerobic is normally made from an acrylic monomer that contains a replenishing supply of free radicals which react with oxygen in the air, allowing the monomer to stay in a liquid form. When pressed between two surfaces the oxygen is restricted and the free radicals are forced to react with the carbon molecules of the monomer itself, forming a polymer group or chain and turning the monomer into a solid. This reaction is quickened with the introduction of a metal, which fuels and increases the production of free radical catalysts.