CS powder is the short form for 2-chlorobenzalmalononitrile (also called o-chlorobenzylidene malononitrile, [(2-Chlorophenyl)methylene]malononitrile) (chemical formula: C10H5ClN2), a cyanocarbon, is the defining component of a tear gas commonly referred to as CS gas, which is used as a riot control agent. Exposure causes a burning sensation and tearing of the eyes to the extent that the subject cannot keep his eyes open, and a burning irritation of the nose, mouth and throat mucous membranes causing profuse coughing, mucous nasal discharge, disorientation, and difficulty breathing, partially incapacitating the subject. CS gas is an aerosol of a volatile solvent (a substance that dissolves other active substances and that easily evaporates) and 2-chlorobenzalmalononitrile, which is a solid compound at room temperature. CS gas is generally accepted as being non-lethal. It was discovered by two Americans, Ben Corson and Roger Stoughton, at Middlebury College in 1928, and the chemical's name is derived from the first letters of the scientists' surnames.

CS was developed and tested secretly at Porton Down in Wiltshire, England, in the 1950s and 1960s. CS was used first on animals, then subsequently on British Army servicemen volunteers. CS has less effect on animals due to "under-developed tear-ducts and protection by fur.

Dayu Chemical is a comprehensive chemical company integrating scientific research, manufacture and international trade of the chemical raw materials of the less lethal technology and ammunition. We can supply more than 30 kinds of chemical raw materials including CS powder, CS liquid solution, OC, PAVA, CN powder, CR powder and raw material of pyrotechnic such as Magnesium Powder, Aluminum Powder etc. The annual production capability of CS powder is 400 ton/ year.

Our production base, located in Xi’an, which is about 10000 square meters with advanced and efficient production lines, imported equipment for experiment and R&D center.