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Thursday, 19 September 2019
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Raw materials & technologies, Technologies

Structural adhesives gain DNV-GL approval for maritime applications

Monday, 1 June 2015

Two methacrylate structural adhesives from Scott-Bader have now been independently approved by DNV-GL as "duromeric” adhesives, suitable for use in the joining of components for marine applications.

The adhesives has been used by a number of specialist composite boatbuilders. Source: Scott Bader

The adhesives has been used by a number of specialist composite boatbuilders. Source: Scott Bader

DNV- GL is a classification society and a recognised advisor for the maritime industry.

Compatible to bond three base materials

Both "Crestabond" 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 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.

Two component primer-less adhesives

The products are two component 10:1 primer-less acrylic adhesives, developed for structurally bonding composites, thermoplastics and metals. The range has been specially designed to meet the bonding requirements of most assembly operations. The adhesives demonstrate good 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. 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% are quoted in the company’s technical data sheet. 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. For the product, tensile strength figures of 16-18 MPa and a tensile modulus of 650-850MPa are quoted, also with an elongation of >100%.

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