"China's economic growth rate is not double-digit any more, but 7 to 8 percent growth is still a very good rate, and we believe China can maintain this rate," Commander said.

"We don't see that China's tire industry is reaching its turning point, and we believe the industry's suffering is temporary."

Over the past several months, China's synthetic-rubber prices have been falling because of oversupply in the domestic market and the state of the macro-economy, according to Sublime China Information Co Ltd, the consultancy that runs the commodities website sci99.com.

However, the average price of butyl rubber has been stable for weeks even though the consultancy doesn't expect a demand increase in the short term.

Butyl rubber is mainly used for tire-making, and modern radial tires require an inner liner made of halobutyl rubber, a special rubber that helps maintain tire pressure.

The new plant, which produces halobutyl rubber as well as regular butyl rubber, went into operation in the first quarter and is being ramped up gradually.

Commercial production will start in the third quarter this year, and the facility will achieve full capacity in 2015, the company said.

Another use for halobutyl rubber is in pharmaceutical closures, and using this special-purpose rubber in China is required by law.

Commander said China's urbanization has led to a rapidly growing improvement in its medical-care system, which will create increasing demand for the special type of rubber.

Public figures show that China's pharmaceutical position by consumption in the world jumped from 10th in 2001 to seventh in 2009 and it is expected to be second, behind only the United States, by 2020.

"We take a long-term view, and we are not discouraged by the current weakness in demand, which we view as temporary," Lanxess Chairman Heitmann said.

The company has invested more than 500 million euros globally in recent years to upgrade and strengthen its butyl rubber manufacturing base. Most of the investment has been aimed at better serving the growing global market and Asia, he said.

The company has steadily increased its presence in China, where Lanxess has nine wholly owned subsidiaries, one joint venture and two major research and development facilities, he said.