1.1 This specification covers dipropylene glycol monomethyl ether (DPM). Note 1—Dipropylene glycol monomethyl ether (DPM) is a mixture of isomers, the predominant isomer This specification covers dipropylene glycol monomethyl ether (DPM). Dipropylene glycol monomethyl ether shall conform to the requirements specified for the following: (1) assay content, (2) distillation range defined by the initial boiling point and d