Tags Viet Phuong (VPG) Investment Group Work starts on first low-iron quartz powder plant in Viet Nam Thursday, Sep 20, 2018 A joint venture by Viet Phuong (VPG) Investment Group and Quarzwerke Group of Germany on Wednesday began construction of a low-iron sand and quartz powder processing plant in Phong Dien District, the central province of Thua Thien – Hue.