M1 is the abbreviation of monomethyltrichlorosilane, which is an organosilicon compound with the chemical formula (CH3SiCl3). M1 is mainly used in the production of organosilicon monomers, silicone oils, silicone rubbers and other organosilicon products, and can also be used to manufacture chemical products such as waterproofing agents, release agents, and defoaming agents.

In the organosilicon industry chain, M1 is an important intermediate, which can generate various functional organosilicon products by reacting with other organosilicon compounds. In addition, M1 also has certain corrosiveness and irritation, and safety protection needs to be noted during use and storage.