BEIJING -- The Ministry of Commerce (MOC) said it started on Thursday a review of the anti-dumping investigation concerning polyurethane products imported from Japan, Singapore, the Republic of Korea (ROK), the United States and the Taiwan region.

During the investigation, polyurethane products from the above exporters will remain subject to anti-dumping tax as high as 61 percent.

The Chinese mainland has imposed anti-dumping measures on the polyurethane imports from those countries and the Taiwan region since 2006, citing "material injury" to the mainland's industry that such imported products had caused.

The investigation will last until Oct 13, 2012, according to a statement by the MOC on its website.