The use of silicone rubber in OEM ignition cable has grown very rapidly. Because of this rapid growth and the lack of uniform test procedures, a variety of new specifications have evolved. Soon there will be an increased demand for silicone aftermarket cable. Unless something is done now to classify and consolidate these requirements, a profusion of new and unrelated specifications will evolve. This can only lead to confusion, additional cost, and perhaps unsatisfactory performance. This problem can be minimized if SAE J557 is revised to encompass the new requirements.