Akromag® Bars are a new form of magnesium oxide. The bar is a dispersion of naphthenic process oil, with the magnesium oxide powder having a typical Iodine absorption figure of 115 on the Morton Activity Index. The properties of activity and particle size of the magnesia are the most important characteristics in determining the final properties of the vulcanized polychloroprene, Hypalon and fluoroelastomers. The two Akromag® MgO Bar Grades (Blue and Green) offer a choice of MgO activity and price. Blue offers the most active grade and thus the most scorch resistance in halogenated polymers like polychloroprene. Green bar offers a less active grade MgO that results in faster scorch and cures times.