Wacker-Chemie GmbH AG's China sales may increase by more than half this year as the German maker of chemicals for consumer products and supplier of silicon wafers to Intel Corp. and Samsung Group taps rising demand. Wacker plans to invest $300 million expanding capacity in the world's fastest-growing major economy in the next three to five years, accelerating from spending of 50 million US dollars in the previous two years, Bloomberg quoted Peter-Alexander Wacker, the company's president and chief executive, as saying. China's need for chemicals and materials for its construction, automotive and electronics industries is rising, prompted by economic growth that reached 11.3 percent in the second quarter. Wacker and Dow Corning Corp., a silicon products maker, are building a 600 million US dollars plant in Zhangjiagang, near China's commercial center of Shanghai. Wacker reported in August that its quarterly net profit rose to 85.30 million US dollars.