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Dong E Blue Sky and SEVEN Color Building Materials Co., Ltd. (known as SEVEN) was established in 1996 in Liaocheng City, Shandong Province, China. Today it is the leading manufacturer of aluminium building materials in China and Asia.

SEVEN has passed ISO 9001 Quality Management System Certification and ISO 14001 Environmental Management System Certification.

In year 2006, SEVEN aluminium composite panels won the awards being 'China Top Brand.

The company has various product lines in China, Taiwan, U.S.A., Germany, Korea and Japan. It has 5 advanced aluminium composite panel production lines, 2 solid aluminium lines, 3 coating aluminium lines and 2 honeycomb panel lines.

The yearly production in 2007 was 8 million square metres of aluminium composite panel, 800,000 square metres of solid aluminium panel, 20,000 tonnes of aluminium coil and 300,000 square metres of honeycomb panel.

SEVEN exports to U.A.E., USA, Australia, Malaysia, Indonesia, Thailand, Germany, Singapore, Brazil, Russia, and Poland.