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Advanced Engineering 2019

Crestabond Primer-Less Structural Adhesives Gain DNV-GL Approval for Maritime Applications

19 May 2015

Crestabond Primer-Less Structural Adhesives Gain DNV-GL Approval for Maritime Applications

Two grades from Scott Bader’s range of Crestabond primer-less methacrylate structural adhesives have now been independently approved by DNV-GL as ‘Duromeric’ adhesives, suitable for use in the joining of components for marine applications. 

According to Scott Bader, DNV- GL is the world’s leading classification society and a recognised advisor for the maritime industry. It says that both Crestabond M1-30 and M1-60 grades passed test criteria which satisfied DNV-GL of their performance capabilities for structural bonding applications in FRP boatbuilding within stipulated operational limits and for specific substrates. According to this new approval, both Crestabond grades are classified as being fully compatible to bond three key base materials:  aluminium; glass fibre reinforced polyester resins; and glass fibre reinforced epoxy resins.

Scott Bader explains that Crestabond M1-30 and M1-60 are toughened, two component 10:1 primer-less acrylic adhesives, developed in-house by Scott Bader for structurally bonding composites, thermoplastics and metals. The range has been specially designed to meet the bonding requirements of most assembly operations. According to published Scott Bader technical information, Crestabond adhesives demonstrate excellent impact, peel, shear, compressive strength and fatigue resistance properties across all bonded parts.  The two approved grades provide a choice of working and fixture times as needed. Crestabond M1-30 offers a working time of 25-35 minutes and a fixture time of 60-80 minutes.  For larger and more complex assemblies, Crestabond M1-60 offers a longer shop floor working time of up to 70 minutes and a fixture time of 150-180 minutes. Typical material property values (tested to ASTM D638) of 17-20 MPa for tensile strength, 750-1000 MPa for tensile modulus and an elongation of >100% for Crestabond M1-30 are quoted in Scott Bader’s technical data sheet; for M1-60, tensile strength figures of 16-18 MPa and a tensile modulus of 650-850MPa are quoted, also with an elongation of >100%.  

Scott Bader says that, being a primer-less adhesive, a key shop floor benefit of all Crestabond grades is that minimal surface cleaning and preparation of substrates is required. This helps to reduce overall production costs and increase productivity.  To further assist shop floor efficiency, productivity and cost control, various packaging options are available: Crestabond M1-30 is supplied in pre-packed 400ml co-axial cartridges for hand guns, and in 18Kg plastic pails or 180Kg drums, which are ideal for bulk dispensing metering systems.  Crestabond M1-60 is also available in 825ml side by side cartridges. 

Photo provided by Scott Bader.





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