Electronic specialty gas supplier Ion Electronic Materials Co (IEMC, 兆捷) yesterday said its self-developed, high-margin products are expected to account for 60 percent of revenue within three years. Over the same period, the company’s annual revenue is forecast to more than double to about NT$1.6 bi. Add TT as Preferred Source Electronic specialty gas supplier Ion Electronic Materials Co (IEMC, 兆捷) yesterday said its self-developed, high-margin products are expected to account for.