Luperox 665M50 1,1-Dimethyl-3-hydroxybutyl Peroxy-2-ethyl hexanoate Arkema North America South and Central America Western Europe Central and Eastern Europe Asia / Pacific Crosslinking / Coupling / Curing Agents Acrylic/Acrylate Resins Polyester Vinyl Coatings Architectural / Decorative Automotive OEM General Industrial /Maintenance odorless mineral spirits Insoluble in water Soluble in organic solvent Luperox® 665M50 is hexylene glycol peroxyesters. Offers the widest range of activity among all the classes of organic peroxides available. Used extensively as initiators in free radical polymerization. It is soluble in most organic solvents and insoluble in water. Hexylene glycol peroxyesters. Offers the widest range of activity among all the classes of organic peroxides available. Used extensively as initiators in free radical polymerization.