... Jiangsu Polycon Co., Ltd has four series of polymer concrete products. They are trench channels, manholes, manhole covers and flumes ... such as Shanghai, Nanjing, Suzhou, Wuxi, Kunming and Shenzhen. The products are also exported to countries such as France, England, ... Jiangsu Polycon Co., Ltd has four series of polymer concrete products. They are trench channels, manholes, manhole covers and flumes. ...