Direct Links Convenience With Tray System Flexibility M O LIN S TO B ACCO MACH IN E R Y Plexus® MA590 is a two-part methacrylate adhesive designed for structural bonding of thermoplastic, metal, and composite assemblies1. Combined at a 1:1 ratio, MA590 has a working time of 90 to 105 minutes and achieves approximately 500 and 1000 psi in 5 and 6.5 hours,