Chinese HFC imports into the USA increased by 80% between 2012 and 2014. The increase put pressure on US producers as they lost market share to the Chinese, and refrigerant prices dropped. As a result, US companies felt they were trading on unequal terms and that jobs were at risk.
The department began the investigation into the 'dumping allegation' in July 2015 when pressure group, the 'American Hydrofluorocarbon Coalition' and its members, submitted an anti-dumping petition protesting against the Chinese imports.
After the petition was filed, Chinese producers and importers appear to have dramatically increased their HFC imports to avoid the 'antidumping duties' before they were enforced. The build-up of HFC refrigerant blends meant that the Chinese firms could trade at unfair prices.
Department of Commerce officials decided that the duties on the HFC blends would be retrospective, meaning that Chinese producers and importers would have to operate on equal terms. The duties came into force on certain imports made after 1st November 2015.