can be employed as a direct substitute for hmdac with a net effect of adding only about 0 5 pph parts per hundred of water to the resulting elastomer essentially without affecting the critical properties of the elastomer the advantages and benefits of such an improved process for curing ethylene acrylate aem and polyacrylate acm elastomers are considered significant an aqueous solution of hmda represents a far more economical alternative relative to the use of hmdac also hmda is preferably employed in an aqueous solution rather than as a solid because as a pure solid it is a corrosive material with a melt freeze point of 40 u00b0 c the aqueous solution of hmda employed in the improved process of the instant invention can generally be any such solution provided that sufficient hmda is employed to achieve the desired crosslinking and the quantity of water does not influence the final properties of the elastomer preferably a concentrated solution of hmda is employed wherein the hmda is the major component conveniently a commercially available solution of typically 70 30 weight ratio hmda h 2 o is employed optionally the aqueous solution of hmda can be mixed or deposited onto one or more fillers or additives thus forming a concentrate this concentrate can then be conveniently employed as the curing agent source during the manufacture of the elastomer by.