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Advanced Composite Manufacturing IRT (Infused Resin Transfer)

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At Mirage Sea Kayaks, performance begins long before a kayak touches the water. Infused Resin Transfer (IRT) is an advanced composite manufacturing process that allows us to build lighter, stronger and more efficient kayak structures than traditional hand lay-up methods. By combining precision laminate engineering with vacuum-assisted resin infusion, every hull and deck is optimised for maximum strength, minimum weight and exceptional durability.

 

The result is a high-performance composite structure capable of handling everything from weekend adventures to some of Australia's most demanding expedition environments.

Advanced Composite Manufacturing for Expedition Grade Sea Kayaks by Mirage

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At Mirage Sea Kayaks, we have spent more than 15 years refining and investing in advanced composite manufacturing technologies. Today, every Mirage composite sea kayak is produced using Infused Resin Transfer (IRT), a sophisticated vacuum-assisted laminating process that delivers superior strength, consistency and weight reduction compared with traditional hand lay-up construction.

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Unlike conventional fibreglass manufacturing, where resin is manually applied to reinforcement fabrics, IRT uses carefully controlled vacuum pressure to draw resin through a precisely engineered laminate stack.

 

This process allows our manufacturing team to produce highly consolidated composite structures with exceptional fibre-to-resin ratios and repeatable quality from one kayak to the next.

Here is an illustration to explain The Mirage Sea Kayak's IRT (Infused Resin Transfer) structure

How Mirage IRT Manufacturing Works

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Every Mirage hull and deck begins with a detailed laminate schedule developed by our composites engineering team.

 

The process typically involves:

1. Precision Mould Preparation

  • High-quality moulds are cleaned, polished and prepared.

  • Marine-grade gelcoat is applied to create the kayak's durable external finish.

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2. Reinforcement Placement

  • Fibreglass, Kevlar® and carbon fibre reinforcements are strategically positioned throughout the mould.

  • Additional reinforcement is added to critical load zones including:

    • Cockpit areas

    • Bulkhead interfaces

    • Deck fitting locations

    • Rudder mounting zones

    • Keel and landing areas

 

3. Core Material Integration

  • Lightweight structural core materials are incorporated where required.

  • These core materials dramatically increase panel stiffness without adding unnecessary weight.

 

4. Vacuum Bag Assembly

  • Flow media, distribution lines and vacuum plumbing are installed.

  • The entire laminate is sealed within a specialised vacuum bag system.

 

5. Resin Infusion

  • A powerful vacuum removes air from the laminate.

  • Marine-grade vinyl ester resin is then drawn through the reinforcement stack under controlled pressure.

  • The vacuum ensures complete wet-out of all fibres while eliminating air pockets and voids.

 

6. Cure and Consolidation

  • Throughout curing, the laminate remains under vacuum pressure.

  • This creates a highly compacted composite structure with excellent interlaminar bonding and superior mechanical properties.

Kevlar IRT

Carbon IRT

Why IRT Produces Better Kayaks

The greatest advantage of resin infusion is laminate consolidation.

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Traditional hand lay-up methods rely heavily on the skill of the laminator to manually wet out fabrics and remove trapped air.

 

This can result in variable resin content, inconsistent weight and potential voids within the structure.

With IRT:

  • Fibre wet-out is highly consistent.

  • Air voids are virtually eliminated.

  • Resin content is tightly controlled.

  • Fibre volume is increased.

  • Structural bonding between layers is improved.

  • Every kayak is manufactured to a repeatable engineering standard.

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The result is a hull and deck that are stronger, lighter and more durable than a conventional hand-laid composite structure.

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Engineering Benefits

By combining advanced laminate engineering with IRT manufacturing, Mirage can optimise every kayak for its intended purpose.

Benefits include:

  • Higher strength-to-weight ratio

  • Improved impact resistance

  • Increased laminate stiffness

  • Reduced structural fatigue over time

  • More consistent production quality

  • Enhanced long-term durability

  • Lower overall kayak weight

  • Greater expedition carrying efficiency

 

Because the infusion process produces such reliable and repeatable laminates, our engineering team can precisely specify reinforcement requirements rather than overbuilding components to compensate for manufacturing variability.

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This allows Mirage kayaks to achieve weight reductions of more than 30% compared with traditional cored hand-laid composite constructions while maintaining exceptional structural integrity.

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Better for Paddlers. Better for the Environment.

IRT also delivers significant environmental and workplace benefits.

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Because the resin is transferred within a sealed vacuum system:

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  • Styrene and VOC emissions are dramatically reduced.

  • Resin waste is minimised.

  • Manufacturing consistency is improved.

  • Workplace exposure to airborne contaminants is significantly lower.

 

The result is a cleaner manufacturing process that aligns with modern composite engineering standards.

Mirage Sea Kayaks IRT is available in the following models:

532 / 582 / 583 Series /  600 Double

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The IRT process works perfectly with the following fibres: Kevlar and Carbon

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