On June 29, caustic soda prices in Shandong region: mainstream negotiation for 32% ion-exchange membrane caustic soda in southwest Shandong is 605-660 yuan/ton; in southern Shandong, mainstream negotiation is 670-680 yuan/ton; in western Shandong, local prices are 620-640 yuan/ton; in northern Shandong, 645-690 yuan/ton; in the entire Shandong region, the 50% ion-exchange membrane caustic soda price is concentrated at 1060-1100 yuan/ton.