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Araldite 2015, a structural bonding technology from Huntsman Advanced Materials, has been selected for the construction of the Neptys First Life 27, a high-tech, semi-rigid power boat.

The Neptys First Life 27 was developed by Airnautics France, a Marseille-based manufacturer of marine composite components.

On account of its short length and speed of 50 knots plus, the Neptys First Life 27 is subject to impact and vibrations.

As a result, the designers had to be sure that the bonding characteristics of the adhesive combination selected could withstand the stress of the environmental conditions at sea.

After prototypes were made with Renshape BM 5460, the project moved on to the assessment of adhesives, where a number of formulations from Huntsman Advanced Materials were trialled.

One of the key objectives for the boat’s construction was to find a solution that would not involve the use of machinery in the dosing and application process.

Samples of the vinyl ester infusion to be bonded were sent to Huntsman’s laboratories at Basel in Switzerland, where the Material Testing Department took these along with the specified marine qualification criteria to conduct a capabilities evaluation programme.

Emphasis was placed on identifying a formulation capable of providing good reactivity for the materials used in the boat’s construction.

Huntsman recommended the use of Araldite 2015, based on its ability to meet the performance characteristics necessary for this type of marine application.

Araldite 2015 is a two-component epoxy adhesive paste that cures at room temperature.

The designers found this adhesive superior to other formulations in providing better reactivity, efficiency and overall quality of design.

While offering high resistance to water, humidity and chemicals, Araldite 2015 is also claimed to deliver improved performance on the water.

This allows the Neptys First Life 27 to withstand the impact of speeds up to 99km per hour.

Designed to be easy to mix, Araldite 2015’s 25-minute work life at 23C proved appropriate for the necessary timescales the designer had set for bonding the deck to the hull, including the internal components.

Particularly important in the decision-making process was the need for a medium time for bonding application (more than 30min, less than 2 hours), low price and less odour during application and polymerisation.

Following the application of the adhesive, the quality of the bonds was tested under rigorous conditions to guarantee that the product could withstand high levels of force and impact while travelling at high speeds on the sea.

A thixotropic solution, Araldite 2015 is resistant to sag at up to 10mm thick.

It is suitable for SMC and GRP bonding, and when formulated for specific applications, it forms durable, elastomeric joints that are water tight and weather resistant, making it suitable for all types of marine applications.

Huntsman Advanced Materials

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