On June 11,2015, the US Department of Commerce made a preliminary anti-dumping ruling on Chinese melamine, with China's general tax rate: 363.31%.
On June 18,2015, the US Department of Commerce announced the list of enterprises with universal tax rates in China, mainly including the following enterprises:
1.Henan Zhongyuan Dahua Group Inc；
2.Hebei Xinji Jiuyuan Inc；
3.Golden Elephant company；
In addition, China's universal tax rate companies also include Anhui Jinhe Industrial Co.，Ltd, Anhui Sunson Chemical Group, Chengdu Yulong Chemical Co.，Ltd, Hebei Jinglong Fengli Chemical Co.，Ltd, Jiangsu Heyou Group Co.，Ltd, OCI Trading（Shanghai）Co.，Ltd and the other 26 companies that did not submit their answers.
On December 9,2014, the US Department of Commerce filed an anti-dumping investigation against China melamine. The dumping investigation period was from Jan. 1,2013 to Dec. 31,2013, and the customs code of the product involved was 2933.61.0000.