From the Sector

Carbon fiber-reinforced polymer lamellas are an innovative method of reinforcing buildings. There are still many unanswered questions regarding their recycling, however. A research project by Empa's Mechanical Systems Engineering lab is now set to provide answers. Thanks to the support from a foundation, the project could now be launched.

The construction sector is responsible for around 60 percent of Switzerland's annual waste. The industry's efforts to recycle demolition materials are steadily increasing. Nevertheless, there are still end-of-life materials that, for the time being, cannot be reused as recycling would be too time-consuming and expensive. One of these are carbon fiber-reinforced polymer (CFRP) lamellas.

Making buildings "live" longer
The reinforcing method developed by Urs Meier, former Empa Director at Dübendorf, has been used in infrastructure construction for 30 years. CFRP lamellas are attached with epoxy adhesive to bridges, parking garages, building walls and ceilings made of concrete or masonry. As a result, the structures can be used for 20 to 30 years longer. The method is increasingly being applied worldwide – mainly because it massively improves the earthquake resistance of masonry buildings.

"By significantly extending the lifespan of buildings and infrastructure, CFRP lamellas make an important contribution to increasing sustainability in the construction sector. However, we need to find a way how we can further use CFRP lamellas after the buildings are being demolished," explains Giovanni Terrasi, Head of the Mechanical Systems Engineering lab at Empa. To achieve this, he wants to develop a method for recycling CFRP lamellas. Convinced by this idea, a foundation supported it with a generous donation. The project officially launched in October.

Gentle separation
First, a mechanical process will be developed to detach the CFRP lamellas from the concrete without damaging them. Initial tests at Empa are encouraging: After the lamellas were separated from the concrete, they still had a strength of 95 percent – even if they had already been used for 30 years.

Then, the demolished CFRP lamellas shall be used to produce reinforcement for prefabricated components. Terrasi's goal: saving thousands of tons of CFRP lamellas from ending up in landfills after the demolition of old concrete structures and reuse them in low-CO₂ concrete elements. After completion of the project, Giovanni Terrasi and his team – consisting of Zafeirios Triantafyllidis, Valentin Ott, Mateusz Wyrzykowski and Daniel Völki – want to produce railroad sleepers from recycled concrete, which will be reinforced and prestressed with demolition CFRP lamellas. This would give the "waste-to-be" material a second life in Swiss infrastructure construction.

SGL Carbon relies on climate-friendly manufacturing processes in the production of its own carbon fibers. By using renewable energy, the carbon footprint of SGL fiber can be reduced by up to 50% compared to a conventional fiber.  

SGL carbon fiber is produced at the Lavradio (Portugal) and Moses Lake (USA) sites. When the Moses Lake site was selected in the 1990s, the use of hydropower as an energy source played a particularly decisive role. As a result, around 75,000 tonnes of CO₂ can be saved in Moses Lake by purchasing electricity from hydropower plants compared to a fossil fuel-based electricity mix.

As part of the consistent implementation of its climate strategy, SGL Carbon will be using a CO₂-neutral biomass system to generate energy from the beginning of 2024, which will make the production system, which was previously based on natural gas, more flexible and climate-friendly. At full capacity, the biomass system in Lavradio can save more than 90,000 tons of CO₂.

The raw material used is wood pellets, which are sourced from a radius of 250 kilometres via short transport routes.

The climate-friendly energy supply at the site in Moses Lake (USA) combined with the new biomass plant in Lavradio (Portugal) lead to a reduction in CO₂ emissions of up to 50% in the production of SGL's own carbon fibers compared to conventional fibers. With the investment in the biomass system, SGL Carbon is pursuing its climate strategy. The target is to save 50% CO₂ emissions by the end of 2025 compared to the base year 2019 and to be climate-neutral by the end of 2038. In the period 2019 to 2022, SGL Carbon has reduced its CO₂ emissions by 17%.

The kick-off meeting for the "Trends and Design Factors for Hydrogen Pressure Vessels" project, recently held at AZL Aachen GmbH, was a successful event, bringing together more than 37 experts in the field of composite technologies. This event laid a solid foundation for the Joint Partner Project, which currently comprises a consortium of 20 renowned companies from across the composite pressure vessel value chain: Ascend Performance Materials, C evotec GmbH, Chongqing Polycomp International Corp. (CPIC), Conbility GmbH, Elkamet Kunststofftechnik GmbH, F.A. Kümpers GmbH & Co. KG, f loteks plastik sanayi ticaret a.s., Formosa Plastics Corporation, Heraeus Noblelight GmbH, Huntsman Advanced Materials, Kaneka Belgium NV, Laserline GmbH, Mitsui Chemicals Europe GmbH, Plastik Omnium, Rassini Europe GmbH, Robert Bosch GmbH, Swancor Holding Co. Ltd. Ltd., TECNALIA, Toyota Motor Europe NV/SA, Tünkers do Brasil Ltda.

The project follows AZL´s well proven approach of a Joint Partner Project, aiming to provide technology and market insights as well as benchmarking of different material and production setups in combination with connecting experts along the value chain.

The kick-off meeting not only served as a platform to foster new contacts and get informed about the expertise and interests of the consortium members in the field of hydrogen pressure vessels, but also laid the groundwork for steering the focus of the upc oming project's ambitious phases. As a basis for the interactive discussion session, AZL outlined the background, motivation and detailed work plan. The central issues of the dialogue were the primary objectives, the most pressing challenges, the contribut ion to competitiveness, and
the priorities that would best meet the expectations of the project partners.

Discussions covered regulatory issues, the evolving value chain and the supply and properties of key materials such as carbon and glass fibres and resins. The consortium defined investigations into different manufacturing technologies, assessing their matu rity and potential benefits. Design layouts, including liners, boss designs and winding patterns, were thoroughly considered, taking into account their implications for mobile and stationary storage. The group is also interested in cost effective testing m ethods and certification processes, as well as the prospects for recycling into continuous fibres and the use of sustainable materials. Insight was requested into future demand for hydrogen tanks, OEM needs and strategies, and technological developments to produce more economical tanks.

The meeting highlighted the importance of CAE designs for fibre patterns, software suitability and the application dependent use of thermoset and thermoplastic designs.

The first report meeting will also set the stage of the next project phase, which will be the creation of reference designs by AZL's engineering team. These designs will cover a range of pressure vessel configurations using a variety of materials and production concepts. The aim is to develop models that not only re flect current technological capabilities, but also provide deep insight into the cost analysis of different production technologies, their CO₂ footprint, recycling aspects and scalability.

AZL's project remains open to additional participants. Companies interested in joining this initiative are invited to contact Philipp Fröhlig.

Indorama Ventures Public Company Limited has been selected for inclusion in the Dow Jones Sustainability World Index (DJSI World) for the fifth consecutive year and the Dow Jones Sustainability Emerging Markets Index (DJSI Emerging Markets) for the seventh year in a row.

Indorama Ventures ranked in the 92nd percentile amongst 11 chemical companies eligible for listing out of 89 chemical companies invited, with a Corporate Sustainability Assessment (CSA) Score of 73 out of 100. The score reflects the company’s best-in-class performance in innovation management, covering product innovation, process innovation, and open innovation, which involves collaborative research and development with external organizations such as customers, suppliers, brand owners, and academic institutions. It also recognizes the company’s achievements in decarbonization, climate change resiliency and adaptation, plastic waste management and recycling, corporate social responsibility, and contribution to the Sustainable Development Goals (SDGs).

Eastman Naia™ Renew cellulosic fiber received Global Recycled Standard (GRS) certification on December 13. This certifies Naia™ Renew recycled content, chain of custody, social and environmental practices, and chemical restrictions.

Textile Exchange, a global non-profit for sustainable change in the fashion and textile industry, manages the GRS certification process. Certification is achieved through an audit from independent third-party certifying body SCS Global Services and applies to the full supply chain and addresses traceability, environmental principles, social requirements, chemical content and labeling.

"We’re honored to add GRS certification to our list of Naia™ certifications that support our sustainability goals,” said Claudia de Witte, sustainability leader for Eastman textiles. “Third-party certifications help us build our brand trustworthiness. It’s our goal to make sustainable textiles available to all, and we do that by building trust with our customers and collaborators. This certification adds even more credibility to our fibers and our sustainability story, which we’re proud to share.”

In June 2023, Textile Exchange made an important announcement regarding its Alternative Volume Reconciliation (VR2) policy, which broadened the range of chemical recycling technologies eligible for mass balance. Notably, this expansion now encompasses gasification, the technical description of Eastman’s molecular recycling technology known as carbon renewal technology. Eastman collaborated with Textile Exchange and other stakeholders to educate the industry about the value and contribution of its molecular recycling technology. This policy update is critical for Eastman because it allows the company’s innovative material-to-material recycling technology to be audited for GRS certification.

Molecular recycling technologies at Eastman break waste down into its molecular building blocks allowing the materials to be used in new materials that are indistinguishable from non-recycled materials. By expanding the GRS to include gasification, the global standard now allows for a broader approach to making sustainable textiles accessible to everyone.

In recent years, the textiles industry has shifted toward circular materials to help tackle one of the largest challenges facing the planet: waste pollution, especially textile waste. Eastman molecular recycling is complementary to mechanical recycling and is a solution for hard-to-recycle waste material, including textiles, which are impacted by factors like fiber blends, chemicals and additives.

Naia™ Renew is produced from 60% sustainably sourced wood pulp and 40% GRS-certified* waste materials that would otherwise be destined for landfills through Eastman's patented molecular recycling technology. The certification verifies the processes of chemical recycling, concentrating, extrusion, and spinning of the undyed yarns and fibers.

Faster and more cost-effective carbon fibre production - the technology of the start-up CarboScreen comes a good deal closer to this dream. The founders Dr. Musa Akdere, Felix Pohlkemper and Tim Röding from the Institut für Textiltechnik (ITA) of RWTH Aachen University are using sensor technology to monitor carbon fibre production, thereby doubling the production speed from the current 15 to 30 m/min in the medium term and increasing turnover by up to €37.5 million per year and system. This ground-breaking development also impressed the jury at the ITMF at their Annual Conference in Keqiao, China, and was honoured with the ITMF StartUp Award 2023 on 6 November 2023.

Dr. Musa Akdere accepted the award on behalf of the CarboScreen founding team.

Carbon fibres can only develop their full potential if they are not damaged during production and further processing. Two types of fibre damage occur more frequently during fibre production: Superficial or mechanical damage to the fibres or damage to the chemical structure.

Both types of damage cannot be optimally detected by current means or only become apparent after production, to name just two examples. This leads to higher production costs. In an emergency, faulty production can even lead to plant fires. For this reason, and to ensure good production quality, the system is run at 15 m/min below its production capacity for safety reasons. However, 30 m/min or more would be possible. With the sensor-based online monitoring of CarboScreen, the production capacity can be doubled to 30 /min. This would lead to higher production, resulting in lower manufacturing costs and wider use of carbon fibres in mass markets such as automotive, aerospace and wind energy.

The adoption of composite parts based on flax fibres by the Marine Industry continues to grow, with major OEMs as well as smaller shipyards now aiming to take advantage of the reduced carbon impact and impressive mechanical properties they can provide.

“Over the last ten or fifteen years, several innovative flax fibre boats have been built and the fibre has started to gain significant traction,” says Julie Pariset, Innovation & CSR Director at the Alliance for European Flax-Linen and Hemp. “In addition to the environmental benefits, manufacturers are realising significant technical and processing gains with flax fibre composites.”

“Flax is a very low-density fibre, with a high specific stiffness,” she explains. “It can be used to manufacture composite laminates with mechanical properties not dissimilar to typical E-glass composites and the coefficient of thermal expansion of a flax fibre epoxy part is also quite close to that of a carbon fibre part.” This allows the materials to work well in combined assemblies with carbon fibre composites and the flax parts are also highly impact resistant.

Flax fibres also provide acoustic and vibration damping in composite applications, as well as providing a warm and aesthetically pleasing appearance below decks.

ecoRacer30
As a member of the Alliance for European Flax-Linen and Hemp, Bcomp, headquartered in Fribourg, Switzerland, has this year been working with Northern Light Composites (nlcomp), based in Monfalcone, northern Italy, on the creation of what is billed as the first fully recyclable nine-metre-long sailing boat – the ecoRacer30.

The boat is based on nlcomp’s proprietary rComposite technology – a combination of thermoplastic resins and BComp’s ampliTex high-performance natural fibre reinforcement fabrics and patented powerRibs technology.

It was built in a collaborative effort with the help of Barcelona-based Magnani Yachts, which took care of the composite manufacturing, and Sangiorgio Marine, which provided technical assistance as the boat was being assembled at its shipyard in Genova, Italy.

Magnani Yachts has subsequently become the first shipyard to hold an rComposite license and others are now being encouraged to adopt the technology.

The second ecoracer30 is currently under construction and has already been sold and nlcomp is planning to build a fleet of eight of these boats in time to enter a series of regattas in the summer of 2025.

Flax 27 Daysailer
Greenboats, based in Bremen, Germany, is another specialist in building boats from natural fibre composites and has this year launched the Flax 27 daysailer.

The lower hull of this vessel is also made from Bcomp’s ampliTex technical fabrics in combination with a sandwich core of recycled PET bottles. Using a vacuum infusion process, the fibres were integrated with a plant-based epoxy resin in order to further reduce the CO₂ footprint of the vessel.

The light structure and modern shapes of the lower hull of the boat result in very fast, sharp and agile handling on the water.

Greenboats has also recently announced significant new backing from alliance member Groupe Depestele, which manages 13,000 hectares of flax land in Normandy, France.

Blue Nomad
A project in Switzerland has meanwhile proposed the use of flax fibre composites in solar-powered habitats designed for comfortable living on the oceans – as the world grapples with the frightening implications of climate change and rising sea levels.

As envisaged by students from Institut auf dem Rosenberg in St Gallen, Switzerland working with Denmark-based SAGA Space Architects, Blue Nomad structures would form modular blocks to establish large communities and oceanic farms.
 

The Lenzing Group has concluded a supply contract with the Austrian electricity producer WLK energy for the purchase of around 13 megawatts of wind power. Lenzing is thus not only underlining its commitment to climate protection and the energy transition, but is also making a long-term investment in a price-stable and diversified electricity supply. The contract has a term of 15 years and provides for supply from the new wind farm in Engelhartstetten from the first quarter of 2025.

The construction of the wind farm is a joint project involving several partners, including the operator and electricity supplier WLK energy, based in Untersiebenbrunn (Lower Austria). The total output of the wind farm with a total of eleven wind turbines will be around 45 megawatts. The share of around 13 megawatts, which will be produced exclusively for the needs of the Lenzing site (Upper Austria), corresponds to the average electricity requirements of around 10,000 households per year in Austria. The ground-breaking ceremony to mark the start of construction took place on November 09, 2023 with representatives from politics and business.

In 2019, Lenzing was the first fiber manufacturer to set itself the goal of reducing its CO2 emissions by 50 percent by 2030 and becoming carbon-neutral by 2050. This CO2 reduction target was recognized by the Science Based Targets Initiative. In 2022, Lenzing opened Upper Austria's largest open-space photovoltaic plant together with Verbund and also signed an electricity supply contract for photovoltaic energy with the green electricity producer Enery and Energie Steiermark.

Solvay announced the future Board of Directors of SYENSQO, effective upon completion of the planned separation of Solvay into two companies – SOLVAY and SYENSQO – which is on track to be completed in December 2023.

SYENSQO’s Board will be composed of 10 members, including 6 independent members, 3 members representing the reference shareholder, Solvac, and the company CEO. They have deep expertise in specialty industries, international business operations, risk management, corporate governance, finance and clean technology.

The following individuals will serve on the SYENSQO Board of Directors:
Rosemary Thorne will serve as independent Director and Chair of the SYENSQO Board, as well as Chair of the Board’s Finance Committee. She is currently an Independent Director on the Solvay Board of Directors, appointed in 2014, and Chair of the Board’s Audit Committee. She is also an Independent Director on the Board of Merrill Lynch International (UK), a wholly-owned subsidiary of Bank of America, serving as Chair of the Audit Committee. Ms. Thorne has decades of financial leadership experience across a wide range of industries. She previously served as Chief Financial Officer at J. Sainsbury, the UK’s largest supermarket chain at the time; Bradford & Bingley; and Ladbrokes. Ms. Thorne previously sat as an Independent Director on the Boards of Royal Mail Group, Cadbury Schweppes, Santander UK, First Global Trust Bank and Smurfit Kappa Group.

Dr. Ilham Kadri will serve as Chief Executive Officer and member of the Board of Directors of SYENSQO. She is currently CEO and President of the Executive Committee at Solvay. Ms. Kadri has successfully led the turnaround of Solvay, delivering double-digit EBITDA growth and 18 consecutive quarters of positive free cash flow, deleveraging the balance sheet and promoting superior people engagement. She is an independent Board member at A.O. Smith and L’Oréal. She is active in non-profit organizations, as Chair of the World Business Council for Sustainable Development (WBCSD), member of the steering committee of the European Round Table of Industrialists (ERT) as well as a permanent member of the World Economic Forum’s International Business Council (WEF). Ms. Kadri has extensive leadership experience across a variety of industries in four continents and with leading industrial multinationals, including Shell, UCB, Huntsman, Dow, Sealed Air. Prior to Solvay, she was CEO and President of Diversey in the USA, led the company’s return to profitability and resulting spin off and divestiture to Bain Capital. She founded two non-Profit foundations: the Solvay Solidarity Fund in Belgium in 2020 which supported more than 7000 families affected by Covid-19 and natural disasters; and founded the ISSA Hygieia Network in 2015 in the USA, to help women in the cleaning industry. She received two Doctor Honoris Clausa from EWHA University in Korea and Université de Namur in Belgium.

Julian Waldron will serve as independent Director and Chair of the Audit Committee. He currently serves as Deputy Executive Chairman of privately-held Albea Group, a global beauty and personal care packaging company which operates 35 facilities in Europe, Asia and the Americas. Mr. Waldron has held senior leadership roles at several leading listed companies in the industrial, technology and services sectors and brings a wealth of expertise in finance and business operations. Prior to joining Albea in 2022, he was Chief Financial Officer of Suez for three years after serving as Chief Financial Officer and subsequently Chief Operating Officer of Technip. He started his career at UBS Warburg where he spent 14 years. Mr. Waldron also served as an independent Board member and Chairman of finance, risk and investments at Carbon Clean, a privately-owned carbon capture company dedicated to achieving net zero.

Heike Van de Kerkhof will serve as independent Director and Chair of the Nomination Committee. She currently sits on the Board of OCI N.V.. Ms. Van de Kerkhof brings more than 30 years of experience in the chemicals, oil & gas and materials industries, having served in numerous leadership roles around the globe. From 2020 to 2023, she was Chief Executive Officer of Archroma Management, a global specialty chemicals company. During her tenure, she successfully completed the transformational acquisition of Huntsman’s Textile Effects business. Prior to her role at Archroma, Ms. Van de Kerkhof served as Vice President of Lubricants, Western Hemisphere at BP, and held positions at Castrol, The Chemours Company, and Neste Corporation. She also held many leading roles within DuPont over 18 years.

Matti Lievonen will serve as independent Director and Chair of the Compensation Committee. He is currently an independent director on the Solvay Board, appointed in 2017. Mr. Lievonen is a proven executive in the energy, forestry, power and automation industries with an extensive track record of leading businesses through climate transition. For over ten years until 2018, he served as Chairman and Chief Executive Officer of Neste Corporation, a global leader in next-generation renewable fuels and chemicals. During his time at Neste, Mr. Lievonen successfully promoted the development of clean fuels as well as Finland’s bioeconomy strategy in advancing renewable transportation fuels. He has also been involved with organizations such as Fortum Board, SSAB, Nynäs AB, Ilmarinen, and the HE Finnish Fair Foundation. Until 2021, Mr. Lievonen was also Chairman of the Board of Directors at Fortum. He has been recognized for his admirable leadership and expertise, and in 2016 was awarded an Honorary Doctorate of Technology by the Aalto University Schools of Technology.

Dr. Françoise de Viron will serve as non-independent Director, Chair of the ESG Committee and Vice-Chair of the Board. She is currently a director of the Solvay Board, appointed in 2013. Ms. de Viron is a regarded academic leader and has extensive experience in innovation, R&D and qualitative research. She is a Professor Emeritus at the Faculty of Psychology and Education Sciences and Louvain School of Management at UCLouvain in Belgium where she has been an Academic Member of various groups at UCLouvain. Ms. de Viron previously served as the president of AISBL EUCEN – the European Universities Continuing Education Network. Prior to her university position, from 1985 to 2000, she was in charge of developing Artificial Intelligence applications at Tractebel S.A. (now Tractebel-Engie).

Roeland Baan will serve as independent Director. He currently serves as President and Chief Executive Officer of Topsoe, a privately-held leading provider of clean energy and petrochemical technologies. He is also Chairman of the Supervisory Board of SBM Offshore NV. Roeland Baan has extensive experience in supply chain management, M&A, business development and operations management. Prior to joining Topsoe in 2020, he was President and CEO of Outokumpu and has held several executive roles at global organizations such as Aleris International, ArcelorMittal and SHV NV. He spent over 16 years in various roles across the globe at Shell, living in South America, in Africa and in the United Kingdom.

Edouard Janssen will serve as non-independent Director. He is currently a Director on the Solvay Board, appointed in 2021. Earlier this year, he was appointed Chief Financial Officer of D’Ieteren Group, a European leader in automotive distribution services. Mr. Janssen is also a Board member of privately-held Financière de Tubize and Union Financière Boël, as well as Co-Founder and Chair of Trusted Family. Mr. Janssen is active in academics, as Vice-Chair of the International Advisory Board of the Solvay Brussels School of Economics and Management and on the advisory board of the INSEAD HGIBS. He brings expertise in finance, strategy, entrepreneurship, business management, planning and marketing. He has served as Solvay’s Vice President in strategy and M&A between 2019 and 2021, and prior to that, he was the US-based General Manager for North- and Latin America at Solvay’s Aroma Performance Global Business Unit.
 
Dr. Mary Meaney will serve as non-independent Director. She is currently a member of the Board of Directors and of the Audit Committee of Groupe Bruxelles Lambert SA. She also sits on the Board of Directors and the Remuneration Committee of Beamery, the privately-held talent management company. She is a member of the Board of Directors and of the Finance Committee of Imperial College, London.Dr. Meaney will bring expertise in Strategy, M&A, and change management, which she acquired over a 24-year career at McKinsey. She was a Senior Partner, served on the McKinsey Shareholders Council and led McKinsey’s global Organization practice.

Nadine Leslie will serve as independent Director and is based in the United States of America. She is currently a member of the Board of Directors of Provident Financial Services , as well as a Non-Executive Director of Seven Seas Water Corporation, a water and wastewater treatment multinational company. She also sits on the Board of Trustees of Hackensack Meridian Health Network and is active as strategic consultant for civil engineering firm T&M Associates. Over a 22-year career at Suez, Ms. Leslie held several leadership positions, the last one being Chief Executive Officer of Suez North America, until 2022. Previously she served as Executive Vice President Health & Safety.

Textiles are a given in civil engineering: they stabilize water protection dams, prevent runoff containing pollutants from landfills, facilitate the revegetation of slopes at risk of erosion, and even make asphalt layers of roads thinner. Until now, textiles made of highly resistant synthetic fibers have been used for this purpose, which have a very long lifetime. For some applications, however, it would not only be sufficient but even desirable for the auxiliary textile to degrade in the soil when it has done its job. Environmentally friendly natural fibers, on the other hand, often decompose too quickly. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are developing a bio-based protective coating that extends their service life.

Depending on humidity and temperature, natural fiber materials can degrade in the soil in a matter of months or even a few days. In order to significantly extend the degradation time and make them suitable for geotextiles, the Denkendorf team researches a protective coating. This coating, based on lignin, is itself biodegradable and does not generate microplastics in the soil. Lignin is indeed biodegradable, but this degradation takes a very long time in nature.

Together with cellulose, Lignin forms the building materials for wood and is the "glue" in wood that holds this composite material together. In paper production, usually only the cellulose is used, so lignin is produced in large quantities as a waste material. So-called kraft lignin remains as a fusible material. Textile production can deal well with thermoplastic materials. All in all, this is a good prerequisite for taking a closer look at lignin as a protective coating for geotextiles.

Lignin is brittle by nature. Therefore, it is necessary to blend the kraft lignin with softer biomaterials. These new biopolymer compounds of brittle kraft lignin and softer biopolymers were applied to yarns and textile surfaces in the research project via adapted coating systems. For this purpose, for example, cotton yarns were coated with lignin at different application rates and evaluated. Biodegradation testing was carried out using soil burial tests both in a climatic chamber with temperature and humidity defined precisely according to the standard and outdoors under real environmental conditions. With positive results: the service life of textiles made of natural fibers can be extended by many factors with a lignin coating: The thicker the protective coating, the longer the protection lasts. In the outdoor tests, the lignin coating was still completely intact even after about 160 days of burial.

Textile materials coated with lignin enable sustainable applications. For example, they have an adjustable and sufficiently long service life for certain geotextile applications. In addition, they are still biodegradable and can replace previously used synthetic materials in some applications, such as revegetation of trench and stream banks.

Thus, lignin-coated textiles have the potential to significantly reduce the carbon footprint: They reduce dependence on petroleum-based products and avoid the formation of microplastics in the soil.

Further research is needed to establish lignin, which was previously a waste material, as a new valuable material in industrial manufacturing processes in the textile industry.

The research work was supported by the Baden-Württemberg Ministry of Food, Rural Areas and Consumer Protection as part of the Baden-Württemberg State Strategy for a Sustainable Bioeconomy.