This document specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of hexamethyldisiloxane for industrial use. This document applies to hexamethyldisiloxane produced by the hydrolysis reaction of trimethylchlorosilane, and also applies to hexamethyldisiloxane produced by the reaction of trimethylchlorosilane and ammonia to produce hexamethyldisilamine. Oxane. This product is mainly used in the production of organic chemicals and pharmaceutical chemicals, and is used as a head sealing agent in the production of silicone oil and silicone rubber. It can also be used as a raw material for silazane, pharmaceuticals, gas chromatography stationary solutions, analytical reagents, etc. Water repellent, etc.