ZH-HNJS type compound type cement, concrete set retarder. This product has a significant set retarding effect to various types of cement and concrete, it is widely used in all kinds of concrete projects, admixture and cement plants that require set retarding. This product is non-toxic, non-flammable and harmless to human health. This product executes the standards of GB8076-2008 (Concrete admixtures), GB50119-2013 (Technical specification for application of concrete admixture), GB/T8077 (Methods for testing uniformity of concrete admixture).