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Yao Hang PP Hollow Plastic Formwork 1.The Description Of PP Hollow Plastic Formwork: Yaohang Brand Plastic Construction Formwork is a new type of energy-saving and green environmental products. It is a new kind of replacement products after wood formwork, composite steel formwork, bamboo and wood pluing formwork, and all-steel formwork. It is light weight, good hardness, impact resistance, easy to install, smooth surface, and stable property under cold and hot weather