Curing of fluoroelastomers (FKM) can be accomplished commercially by three separate systems. The first curing system was developed using hexamethylene diamine. Although cured articles with diamines gave excellent water resistance, processing was an issue. Bisphenol curing system was developed in the 1970s as an improvement to diamines and have since been used as the primary curing system for a wide variety of FKM. Some FKM types though cannot be cured with bisphenols and need to use a third type of cure system, namely the peroxide system. This is accomplished by incorporating a cure site monomer in the polymer backbone which participates in the crosslinking mechanism. In the current paper, the bisphenol curing system is explored with the intent of understanding effects of varying metal oxide levels on properties. The two most widely used metal oxides are magnesium oxide and calcium hydroxide. They can be used individually but it is more common to use a combination of the two at different levels to achieve a set of properties. Effects of these different levels on cure rate would be important while formulating a FKM compound. It is hoped that the information presented will aid in developing formulations that achieve a balance between final cured properties and molding cycle times.