BEIJING, Aug 1 (Reuters) - China's export controls on some gallium and germanium products take effect on Tuesday, with traders braced for a drop in international supply in August and September while exporters sort out newly required permits. China, the world's top supplier of the two minor metals used to make semiconductors, announced restrictions on the exports of eight gallium and six germanium products in early July, citing national security reasons. At the same time, the export restrictions are expected to result in a growing surplus of the products in China. Chinese exports of wrought germanium and germanium products in the first half totalled 27,825 kg, up 75.5% from a year earlier, customs data showed. Exports of wrought gallium and gallium products totalled 17,565 kg, down 53.5%.

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Persons: Willis Thomas, CRU's Thomas, Andrew Hayley, Florence Tan, Jason Neely, Jan Harvey Organizations: China's Ministry of Commerce, Reuters, Commerce, China Nonferrous Metals Industry Association, Beijing Newsroom, Thomson Locations: BEIJING, China, London, Rotterdam, Beijing