The common cord materials for reinforcement of car tires are steel for the main belting. Plastic fiber cords of polyester, nylon and rayon tend to be used for carcass and cap plies.
This paper will present alternative cords made from rubber-impregnated glass fiber, aramid fiber and carbon fiber.
The history of these cords will be reviewed and brought up to date with modern materials and techniques. This will include the properties of high tensile strength glass and improved cord plying processes for extended fatigue performance. These have the potential to allow significant light-weighting of the tires by replacement of the steel. Novel constructions involving two-material cords (such as glass wrapped carbon hybrid cords) allow significant flex fatigue life to be obtained.