y in typical formulations the curing agent comprises from about 0 5 phr to about 8 phr and more preferably about 2 phr to about 5 phr as referred to herein and generally accepted in the art u201c phr u201d means parts by weight per one hundred parts by weight polymer the curing package preferably also includes at least one phosphate cure accelerator in the case of a sulfur curing agent the accelerator can be by way of example rhenocure u00ae ap 5 rhenocure u00ae ap 7 rhenocure u00ae ap 3 rhenocure u00ae zadt g and rhenocure u00ae s g which are available from rhein chemie corporation of trenton n j and accelerator vs available from akrochem corporation additional cure accelerators that may be used in combination with the phosphate cure accelerator include butyl zimate benzothiazyl disulfide commercially known as altax u00ae dithiocarbamate containing blends such as akroform u00ae delta p m from akrochem corporation and sulfides such as dipentamethylenethiuram hexasulfide such as sulfad u00ae from r t vanderbilt company inc of norwalk conn while the use of accelerator vs was initially unacceptable in some formulations because of the foul odor problem it generated it has also been now found that such formulations can be prepared with no significant odor if about 1 0 phr magnesium oxide is added thereto suitable cure activators for the curing package include metal oxides such as zinc oxide e g tzfd 88p from rhein chemie corp magnesium oxide e g elastomag u00ae 170 from morton chemical co and stearic acid including palmitic acid which is available from harwick standard distribution corp of.