Background The benefits of components and products designed and produced in fibre-reinforced composite materials to substitute metals are well recognised by many industries. The higher strength, lower weight and reduced maintenance requirements of these materials has led to many engineering applications in the transport industry and the construction sector. Thermoset composites are more widely used than thermoplastic composites because they enable easier fibre impregnation and therefore easier processing, higher thermal stability, stiffness, strength and resistance to creep. However, these thermoset composites present two major environmental problems. Firstly, recycling or reuse of conventional thermoset composites is extremely difficult as they cannot be remoulded, reshaped or dissolved. Secondly, current composite applications mainly use non-renewable petroleum-based resources. On the other hand, European strategic sectors, such as the transport industry, require more sustainable materials and need to fulfil European regulation in terms of waste management. Solutions are needed to reduce the problem of composite disposal, to avoid incineration or landfill. Objectives The RECYSITE project aims to develop thermoset eco-composites from renewable resources: natural fibres from bio-waste (linseed fibres) and resins from natural resources (linseed oil and humins). ‘Linseed straw’ is either disposed or directly burned on the fields due to its low rate of disintegration in the ground. Nevertheless, these linseed stems contain fibre material that can be valorised. The project will optimise the treatment of two bio-materials - fibres and resins - in two pilot plants that are used to produce cost-efficient and 100% recyclable eco-composites. It will then validate the proposed solutions in two different sectors: transport and construction sector. In particular, the project will validate the composites in refrigerated swap body for the transport industry; and modular façade walls for the construction sector. These two sectors have been chosen due to their relevance in the European economy. They actually involve more than 15% of the jobs and GDP in Europe, which will help boosting the transferability of the results. The project will contribute to the implementation of a range of EU policy and legislation, including the Roadmap to a Resource Efficient Europe and its goal of turning waste into resources, and the End-of-Life Vehicles Directive, establishing that the design and production of new vehicles facilitates their dismantling, reuse, and the recovery of components and materials. Expected results: The project expects to achieve the following results: Development of innovative processes for the recycling of new biomaterials via the recovery of the fibre and matrix; Production of individual components from composites with a 100% recyclability rate and substantial weight reduction with cost-effectiveness and quality; In the transport sector, the selected demonstrator will be built with a target curb weight reduction of 30-50% and reduced raw material consumption of up to 30% with respect to the current metallic parts; In the construction sector, the use of conventional composite materials will target decreases in the production due to the use of sustainable lightweight composite materials having at least 20% lower carbon footprint than the conventional cement; Processing of 100 tonnes/year of natural fibre and 40 tonnes/year of bio-based thermoset resins; Evaluation of the project’s impact on the environmental problems identified and on the socioeconomic conditions; and Preparation of support documents for Spanish, French, Belgium and Dutch governments for the recycling strategies and methodologies in transportation and construction, in terms of employment and economic growth.