Primary wire is commonly used in automotive and general electrical applications. Del City’s 18 gauge wire is manufactured with single copper conductor wire and a polyvinyl chloride (PVC) insulation. The PVC insulation features a smooth surface for easy use in your application. This insulation also protects the 18 gauge wire against grease, oil, and acids with added strength and durability. 18 gauge wire can be ideally used in both custom project and replacement situations. The primary 18 gauge wire is available in a variety of spool sizes and colors for the specific needs of your application.