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Why Methacrylates?...A Comparison between Epoxies, Urethanes and
Methacrylates*
Methacrylates
Advantages · Moderately priced · Good gap fill · Excellent impact resistance and flexibility · Excellent peel and shear strengths · Substrate versatility · Medium/fast cure · Tolerant of dirty surfaces · Can be dispensed from most packages · Good flexibility at low temperatures Limitations · Some odor problems · Flammable
Urethanes · Epoxies – Epoxies lack solvating ability, as a result they generally perform poorly onthermoplastics and require careful cleaning or surface preparation on metals and composites. Epoxies can exhibit very high strength but are limited in impact, particularly at low temperature. · Urethanes – Urethanes can have good adhesion to metals and composites but, likeepoxies, have some weakness in thermoplastic bonding and often require primers to bond. The structure of urethanes can give them excellent performance at low temperatures, but they weaken quickly at high temperatures. * From Plexus Bondline newsletter March 2006 |
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