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ITW Plexus has introduced 1:1 ratio methacrylate adhesives for structural bonding of large composite structures fabricated in the marine industry. Two products have been released: MA560 and MA590 with more formulations scheduled for future release.
MA560 has a working time of 60 minutes while MA590 has a working time of 90 minutes. Both can be dispensed in large masses and bonds gaps of up to 25mm and 37mm. “We’re very excited about this technological breakthrough. The long open times, anti-sag properties, the ability to cure in large gaps without boil, small gaps without worry of inconsistent cure, all while being packaged in a 1:1 formulation,” said Pat Shannon, National Marine Accounts Manager of ITW Plexus.
Another advantage associated with the 1:1 products is the high dispensing rates; up to 7.5 litres per minute. “Dispensing rates are especially critical when bonding stringers larger than 8.5m in length. The increased dispensing rates along with the extended open times allow a manufacturer plenty of time to dispense and fixture large stringer assemblies”, Shannon notes.
MA560 and MA590 were initially designed for the installation of composite stringers. However, because of their ability to consistently cure in small gaps, these products are also suited in applications such as deck and hull joints or radar arch assemblies where bond gaps are typically very thin.
The 1:1 technology uses a non-geroter metering system that simplifies maintenance. It also allows for easy hand mixing for field repair or for smaller users who are not ready for the purchase of metering equipment.
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