Qingdao Topsen chemical is based in China and lists products such as 90%-96% High Active Magnesium Oxide, 40% Zinc Rubber Sulfide Active Agent, Flame Retardant Synergist For Elastomers, Low Zinc Masterbatch Cr510 Replace Zinc Oxide 80, High Activity Agent For Concrete Cement N90, and Rubber Grade Nano Zinc Oxide Masterbatch. The company lists 2009 as its year of establishment. Buyers can send an enquiry through Global Trade Plaza.