On June 5, caustic soda prices in Shandong region: Southwest Shandong 32% ion-exchange membrane caustic soda main negotiation range 580-600 RMB/ton; Central and East Shandong 32% ion-exchange membrane caustic soda main transaction range 570-630 RMB/ton; North Shandong 32% ion-exchange membrane caustic soda main transaction range 600-660 RMB/ton; South Shandong 32% caustic soda for retail customers 630-640 RMB/ton; West Shandong region 560-600 RMB/ton.