Zhengdan Chem has perfect analyzers and excellent analysts.Now the QC center has a number of imported ana lytica l instruments as GC-MS, liquid chromatography apparatus, gas chromatography apparatus, melting point apparatus, atomic absorption spectrophotometer, etc. Including five senior engineers, over fo rty ana lysts should receive related certificates after strict training and assessment. By the whole-course tracking and detecting of the raw and auxiliary materials, manufacture process and finished products, the QC center could guarantee the high quality and 100 percent pass rate of the products.