This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of 3,3′-diethyl-4,4′-diaminodiphenylmethane (hereinafter referred to as MOEA). This standard applies to MOEA products produced by the reaction of formaldehyde and 2-ethylaniline through condensation, dehydration and other processes. The product is mainly used as a chain extender for polyurethane elastic materials and can also be used to cure epoxy resin.