WEST SYSTEM 105 System

Product info

WEST SYSTEM® 105 – Premium Marine Epoxy Resin

WEST SYSTEM® 105 Epoxy Resin is a clear, low-viscosity, solvent-free liquid epoxy formulated to deliver reliable, high-strength bonding across a wide range of marine and composite applications. When combined with any of the WEST SYSTEM® hardeners, 105 cures over a broad temperature range to form a tough, durable, moisture-resistant solid with excellent adhesion to a variety of substrates.

Engineered specifically for timber, fibreglass, reinforcing fabrics, composite laminates and metals, 105 wets out fibres efficiently, penetrates timber surfaces deeply and bonds securely to prepared surfaces. Its controlled flow and film properties allow it to self-level when applied by roller, producing an even, consistent finish.

When modified with WEST SYSTEM® fillers, 105 becomes an exceptional gap-filling adhesive, fairing compound or structural putty capable of bridging voids, bonding irregular surfaces and being shaped, drilled or sanded after cure. This makes 105 one of the most versatile epoxy systems for marine construction, repair, fabrication, moulding, furniture building and composite work.

KEY PERFORMANCE FEATURES

Low-Viscosity, Solvent-Free Marine Epoxy Resin
Excellent Wet-Out For Timber, Fibreglass & Reinforcements
Strong, Durable Bonds Across Multiple Substrates
Wide Temperature Cure Range With Hardeners
Superior Moisture Resistance For Marine Environments
Outstanding Thin-Film Flow & Self-Levelling Behaviour
Ideal For Structural Bonding, Lamination & Fabrication
Gap-Filling & Fairing Capabilities When Used With Fillers

TECHNICAL SPECIFICATIONS

Pot Life	205 Fast Hardener 9 min 206 Slow Hardener 20 min 207 Special Clear Hardener 23 min 209 Extra Slow Hardener 37 min
Mix Ratio	205 Fast & 206 Slow Hardener 1 Part Hardener to 5 Parts Resin 207 Special & 209 Extra Slow Hardener 1 Part Hardener to 3 Parts Resin
Compatible Hardener	205 Fast Hardener 206 Slow Hardener 207 Special Clear Hardener 209 Extra Slow Hardener
Physical State	105 Resin Clear Liquid 205 Fast Hardener Clear Liquid 206 Slow Hardener Clear Pale Amber Liquid 207 Special Clear Hardener Clear Pale Yellow Liquid 209 Extra Slow Hardener Clear Pale Yellow Liquid
Pack Size	R105 + 205 or 206 Hardener 600 mls / 1.2 \| 4.8 \| 24 \| 240L R105 + 207 or 209 Hardener 660 mls / 1.33 \| 5.33 \| 26.7 \| 267L

WEST SYSTEM 105 Epoxy

WEST SYSTEM 105 Engineering Data

frequently asked questions

How does ATL tailor composite systems for different industries?

Every industry has distinct performance, compliance, and manufacturing requirements. ATL’s in-house chemists and engineers develop and refine epoxy systems, adhesives, and core materials to meet the specific demands of marine, defence, aerospace, automotive, industrial, civil, architectural, and sporting applications — ensuring every product delivers optimal strength, efficiency, and durability.

Can ATL customise materials for my project or process?

Yes. ATL offers custom formulation and process engineering support to align material performance with your production requirements — whether infusion, hand lay-up, lamination, bonding, or CNC-routed panel construction. Our technical team collaborates closely with customers to deliver precision-matched resin systems and structural solutions for unique applications.

Are ATL’s composite systems certified for high-performance applications?

Absolutely. ATL operates under an ISO 9001:2015-certified quality management system, with selected materials approved by DNV for use in structural and high-load applications. Every ATL system is manufactured to exacting standards of performance, consistency, and traceability to meet the demands of defence, industrial, and advanced engineering environments.

What makes ATL’s materials suitable for large-scale or structural builds?

ATL’s epoxy systems, structural panels, and composite cores are engineered for high strength-to-weight performance, dimensional stability, and fatigue resistance. These attributes make ATL materials ideal for large composite assemblies, modular structures, and precision-engineered components where long-term strength, weight reduction, and reliability are essential.

Does ATL offer sustainable or bio-based composite options?

Yes. ATL is committed to advancing sustainable composite technology, offering USDA-Certified Bio-Based epoxy systems and environmentally conscious materials that reduce waste, extend service life, and minimise environmental impact. Our ongoing R&D focuses on improving sustainability without compromising structural integrity or mechanical performance.

How can I select the right ATL system for my application?

Choosing the ideal composite system depends on your structure’s design, load requirements, manufacturing process, and environmental exposure. ATL’s in-house engineers and chemists provide tailored advice to ensure the correct combination of resin, core, adhesive, and surface technology for your project.
To discuss your application or request technical guidance, contact ATL’s Technical Team — we’ll help you identify the most effective and efficient composite solution for your build.

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