In 1818 Tervakoski (telva high) Company in northern Europe and Finland founded, environmental protection and the quality of leadership is the company's core values; more than 40 years ago Tervakoski insulation products to China and service in high voltage cable and ultra high voltage transformer industry; today we cooperate with Nantong on Chicago Electric Power Material Co., Ltd. was established in Nantong telva high insulation material Co., Ltd., ...