Civilian applications

Advanced Composite solutions for civilian applications

Marstrom Composite develops and manufactures advanced composite solutions for civil applications where the requirements for low weight, high strength and long service life are critical. With the same precision and material know-how as in our naval and defence-related projects, we supply components for everything from high-performance sailboats and industrial machines to commercial aircraft.

Our technology, based on autoclave-hardened carbon fiber prepreg, enables the production of structures with exceptional shape accuracy, dimensional stability and surface finish – whether for single prototypes or series production.

Full In-House Production Chain for High-Precision Composites

We offer a complete production chain where the entire process takes place under one roof – from design and drawing to mold manufacturing and finished composite product. In our own modern tool production, both small and large molds are manufactured around the clock in 3- and 5-axis CNC machines with the highest accuracy.

This gives us full control, short lead times and flexibility at every step – whether prototypes, small series or full-scale production.

Thanks to our long experience, high quality and close customer collaborations, Marstrom is a sought-after partner in several civilian industries – where composites are used to create innovations that roll longer, fly lighter and perform better.

Spar building at Marstrom

At Marstrom Composite, we specialize in building some of the world’s most advanced carbon fibre spars. With over 40 years of experience and cutting-edge in-house technology, we manufacture spars that are light, strong, and built to perform in the most demanding conditions.

Engineering-Driven Design

Every spar we build begins with detailed structural modelling:

Full Aero load study of key load cases.
FEM (Finite Element Modelling) for global buckling
FEA (Finite Element Analysis) for local buckling

Key Advantages

Autoclave-cured carbon prepreg construction
6 bar standard autoclave pressure (up to 12 bar on select projects)
CNC-controlled cutting for precision
“Zero-fairing” carbon tooling
One-shot lamination process
Longitudinal split moulds for optimal layup integrity

Precision Manufacturing Process

The spar production process begins with computer-controlled prepreg cutting, similar to sailmaking. Simultaneously, the carbon fibre tooling is prepared and treated. Using carbon tools ensures thermal compatibility with the final part and delivers a superior surface finish with minimal fairing required.

Rather than using flat panel layup, we build layer-by-layer directly into the mould – minimizing internal stress. The tooling is longitudinally split, making it easier to access corners and avoid bridging. The spar halves are joined using an overlapping laminate system, ensuring superior strength compared to glued or riveted alternatives.

During layup, the laminate is vacuum debulked in intervals to ensure compaction and air evacuation. Before curing, the component is held under vacuum for 12 hours to ensure the highest quality and void-free structure.

Assembly & Finishing

Once cured, a light fairing compound is applied to fill micro pinholes – 99% of which is sanded off – preserving the structural laminate. Hardware positions are marked using precision templates, and holes are CNC-cut for fittings.

All spars are painted in our temperature-controlled spray booth for a flawless finish.

Marine applications

Marstrom Composite is internationally recognized for its advanced spars and lightweight carbon fiber structures. The company was founded in 1983 to manufacture the Olympic Tornado catamaran – an effort that took inspiration from the aerospace industry’s advanced composite technology, which included parts for the JA 37 Viggen being manufactured in autoclave-hardened prepreg.

Since then, Marstrom has delivered over 2000 hulls and thousands of masts to racing sailors and special projects worldwide. The technology has been refined to include so-called one-shot production, where the hull, mast, rudder and keel blade are manufactured in one piece – for maximum precision, minimum weight and optimal hydrodynamic resistance.

Application examples:

Prepreg carbon spars, booms and struts
Hulls, rudders and keel blades for multihull and foil boats
Custom Composite Solutions for Special Marine Projects
Lightweight, corrosion-free components for decks and rigging

Marstrom combines its long marine tradition with modern technology – for sailors, designers and shipyards seeking uncompromising performance.

Industrial use

Composite materials offer unique opportunities for industrial innovation. With an unmatched strength-to-weight ratio and high fatigue resistance, composites enable lighter, stronger and more energy-efficient structures than traditional materials.

Marstrom Composite collaborates with forward-thinking companies to develop both prototypes and serial production components for performance-critical applications. From carbon fibre exoskeleton frames to precision tables used in advanced semiconductor equipment, our experience spans multiple sectors.

Field-Ready Composite Solutions

One standout example is our development of lightweight composite containers for NKT, used for cable splicing in the field. By drastically reducing weight, the container enables easier transport and handling while increasing payload efficiency in mobile setups. It’s a solution that exemplifies how composites can improve performance and operability in tough environments.

We’ve also delivered:

High-strength rollers for Triton Valsteknik
Carbon fibre sound cabinets cabinets for Martens Audio
Composite tables for Mycronic mask writers
Composite components for robotics, bridges, cranes, medtech and the film industry

Automotive

Through our subsidiary Carbonia Composites, we are an established Tier 1 supplier, development partner, and serial manufacturer of advanced carbon and fiberglass components to leading European automotive OEMs. Our projects combine cutting-edge composite technology with high-volume capability. In addition to Carbonia’s volume manufacturing capabilities, Marstrom Composite also delivers prepreg-based autoclave-cured components for automotive applications. This includes lightweight, high-strength parts such as bus body panels and structural elements where performance and precision are paramount.

Highlights include:

The first full body for Koenigsegg
Carbon fibre suspension wheels developed with Caran/Volvo
Bus bodies for Scania and UAB Vejo Projektai
Structural components for solar-powered vehicles in university R&D projects

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Aerospace

Marstrom Composite manufactures advanced composite components for aerospace applications where every gram, every detail and every choice of material is crucial. Our products are used in everything from UAV systems and research platforms to commercial passenger aircraft. We produce aviation-related products with high demands on quality and safety.

Components are manufactured using autoclave-hardened prepreg technology and undergo rigorous checks to ensure mechanical performance, traceability and long-term reliability.

More than 1,500 aircraft – including the Boeing 737, 757 and Airbus A320 series – are currently flying with parts made by Marstrom. In addition, over 500 drones and helicopters are equipped with our camera housings – developed in composite for the optimal balance of low weight, strength and vibration damping.

Marstrom also carries out repairs on behalf of airlines and helicopter workshops around Sweden – with the same precision and accuracy as in new manufacturing.