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7.3.3 Acrylics and methacrylates structural adhesives 2 components adhesives, with various mixing ratios, fast curing at room temperature (from 10 minutes to 2 hours), high shear resistance (10 to 30 MPa), excellent adhesion to almost all plastics and composites, high impact strength and fatigue resistance (widely used for boat assembly which must resist to very frequent shocks on the waves), good resistance to water and chemicals, medium price. These adhesives are developing fast, they may replace the polyester adhesives and some epoxies when a more flexible bond is required. 7.3.4 Polyesters Polyester resin manufacturers are offering some improved polyester adhesives, which react after the addition of a catalyst. These adhesives are mostly used for bonding reinforced polyester parts in boat con- struction, because this industry is accustomed to make reinforced polyester parts.They are rigid, may be brittle, but they have very good gap filling properties. Shear resistance is approximately 10 MPa.They may be used for deck to hull assembly. They are generally low cost. 7.3.5 Urethane-acrylates Highly flexible, often structural adhesives adhesives. Cure by addition of 2 % catalyst in 1 to several hours at room temperature. Excellent adhesion with plastics, metal, wood subtstrates. Reasonable shear resistance ( 10 to 15 MPa ), good impact resistance and resistance to crack propagation. They also have gap filling properties up to 10 mm (with some grades) and good resistance to moisture ingress. They are mostly used for boat construction and bonding of automotive body parts. 7.3.6 Heat stable adhesives: Bismaleimides, polyimides, cyanate esters These are expensive adhesives, mostly delivered in films, which resist to high tem- peratures, for instance service temperatures of 250 to 300°C for polyimides, 200 to 250°C for the bismaleimides, They are difficult to use because they require curing under high temperatures (300°C) and high pressures (15 bars) – therefore autoclave or press processing is a requisite. Usually only used in aerospace applications to bond parts which are resistant to high temperatures (for instance some parts of the surface of military supersonic aircrafts may reach 260°C during some flight conditions). GTC-6-0417 - 61PDF Image | GUIDE TO COMPOSITES
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