This document specifies the requirements, test methods, inspection rules, marking and accompanying documents, packaging, transportation and storage of methylene chloride. This document is applicable to the waste liquid produced by the synthesis of cephalosporins, meropenems, abamectins, and penicillins in the pharmaceutical industry as raw materials, and is used for the recovery of methylene chloride obtained through pretreatment, distillation and other processes. Chemical production.