{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T20:49:37Z","timestamp":1772225377239,"version":"3.50.1"},"reference-count":41,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,7]],"date-time":"2022-01-07T00:00:00Z","timestamp":1641513600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sustainability"],"abstract":"<jats:p>Based on global needs for sustainable development, finding new sustainable materials that can replace oil-based ones for mass products is crucial nowadays. This paper focuses on employing an expanded cork-based composite to produce a surfboard. To evaluate the mechanical properties, uniaxial tensile and compression tests were performed on the skin and core materials, respectively. Bending tests were performed on the entire representative composite structure. Numerical models of the tests were arranged and validated from experimental results. From that, a surfboard prototype model was used to simulate some experimental conditions, permitting us to draw promising conclusions. An actual prototype was also produced. It was found that expanded cork performs very well when sandwiched between wood and polyester resin\/glass fibre, being able to hold substantial loads and at the same time reduce weight and the environmental footprint of the composite by 62.8%. It can be concluded that expanded cork is an excellent candidate to replace oil-based foams in surfboard manufacturing. Despite a slight increase in weight, this sustainable material aligns with all the philosophies of surf practice worldwide.<\/jats:p>","DOI":"10.3390\/su14020668","type":"journal-article","created":{"date-parts":[[2022,1,9]],"date-time":"2022-01-09T23:35:09Z","timestamp":1641771309000},"page":"668","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Expanded (Black) Cork for the Development of an Eco-Friendly Surfboard: Environmental Impact and Mechanical Properties"],"prefix":"10.3390","volume":"14","author":[{"given":"Jos\u00e9 M. D.","family":"Correia","sequence":"first","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6668-5485","authenticated-orcid":false,"given":"Gabriel F.","family":"Serra","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5848-6424","authenticated-orcid":false,"given":"Ricardo J.","family":"Alves de Sousa","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8342-5116","authenticated-orcid":false,"given":"Ant\u00f3nio B.","family":"Pereira","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9751-8807","authenticated-orcid":false,"given":"F\u00e1bio A. O.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Warren, A., and Gibson, C. (2014). Surfing places, surfboard makers: Craft, creativity, and cultural heritage in hawai\u2019i, california, and Australia. Surfing Places, Surfboard Makers: Craft, Creativity, and Cultural Heritage in Hawai\u2019i, California, and Australia, University of Hawaii Press.","DOI":"10.21313\/hawaii\/9780824838287.001.0001"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s12283-021-00358-x","article-title":"Surfing equipment and design: A scoping review","volume":"24","author":"Romanin","year":"2021","journal-title":"Sports Eng."},{"key":"ref_3","first-page":"44","article-title":"The history and future of surfboard design","volume":"55","author":"Chotikapanich","year":"2018","journal-title":"JEC Compos. Mag."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Gibson, C., and Warren, A. (2017). Surfboard making and environmental sustainability: New materials and regulations, subcultural norms and economic constraints. Sustainable Surfing, Taylor & Francis Group.","DOI":"10.4324\/9781315680231-6"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Pickering, K. (2008). Natural-fibre composites in structural applications. Properties and Performance of Natural Fibre Composites, Elsevier.","DOI":"10.1533\/9781845694593"},{"key":"ref_6","unstructured":"Stone, A. (2021, October 19). Green Wave. Forbes, Available online: www.forbes.com\/forbes\/2008\/0901\/058.html."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Soltani, A., Noroozi, R., Bodaghi, M., Zolfagharian, A., and Hedayati, R. (2020). 3D printing on-water sports boards with bio-inspired core designs. Polymers, 12.","DOI":"10.3390\/polym12010250"},{"key":"ref_8","first-page":"65","article-title":"Ultimate use of cork\u2013unorthodox and innovative applications","volume":"29","author":"Mateus","year":"2017","journal-title":"Cienc. Tecnol. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Oggiano, L., and Panhuis, M.i.h. (2020). Modern Surfboards and Their Structural Characterisation: Towards an Engineering Approach. Proceedings, 49.","DOI":"10.3390\/proceedings2020049065"},{"key":"ref_10","unstructured":"Lost Surfboards (2019, March 03). Carbon Cork Composite. Available online: https:\/\/lostsurfboards.net\/carbon-cork-composite\/."},{"key":"ref_11","unstructured":"United Nations (2019, March 14). Sustainable Development Goals. Available online: https:\/\/www.un.org\/sustainabledevelopment\/development-agenda\/."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1007\/BF02663799","article-title":"Influence of raw-material quality and process parameters in the production of insulation cork agglomerates","volume":"51","author":"Pereira","year":"2007","journal-title":"Holz Roh-Werkst."},{"key":"ref_13","unstructured":"APCOR (2019, February 10). Realcork\u2013Pure Expanded Agglomerate. Available online: https:\/\/www.apcor.pt\/en\/cork\/processing\/industrial-path\/pure-expanded-agglomerate\/."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1016\/0921-5093(89)90215-3","article-title":"Scanning electron microscopy observations of insulation cork agglomerates","volume":"111","author":"Pereira","year":"1989","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"04016198","DOI":"10.1061\/(ASCE)MT.1943-5533.0001718","article-title":"Performance of Expanded High-Density Cork Agglomerates","volume":"29","author":"Knapic","year":"2016","journal-title":"J. Mater. Civ. Eng."},{"key":"ref_16","unstructured":"Corticeira Amorim (2021, September 21). The Art of Cork. Available online: https:\/\/www.amorim.com\/xms\/files\/v1\/Documentacao\/Brochura_Arte_Cortica_Small_EN.pdf."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1016\/j.ctmat.2013.12.008","article-title":"Insulation corkboard for sustainable energy and environmental protection","volume":"25","author":"Gil","year":"2013","journal-title":"Ci\u00eancia Tecnol. Mater."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"925","DOI":"10.1016\/j.jclepro.2016.12.028","article-title":"Carbon footprint of the insulation cork board","volume":"143","author":"Mata","year":"2017","journal-title":"J. Clean. Prod."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"5512","DOI":"10.15376\/biores.12.3.5512-5524","article-title":"Natural cork agglomerate as an ecological alternative in constructional sandwich composites","volume":"12","author":"Urbaniak","year":"2017","journal-title":"BioResources"},{"key":"ref_20","unstructured":"Ribeiro, M.C.d.S. (2006). New Polymer Mortar Formulations. [Master\u2019s Thesis, Universidade do Porto]."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1016\/j.promfg.2017.09.055","article-title":"Manufacturing and testing composites based on natural materials","volume":"13","author":"Fernandes","year":"2017","journal-title":"Procedia Manuf."},{"key":"ref_22","unstructured":"Amorim Isolamentos (2019, May 23). Pavilh\u00e3o de Portugal da Expo Xangai Ganha Pr\u00eamio de Design. Not\u00edcias, Media-Amorim Isolamentos. Available online: https:\/\/www.amorimisolamentos.com\/media\/noticias\/Pavilhao-de-Portugal-da-Expo-Xangai-ganha-premio-de-design\/243\/."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1255","DOI":"10.1080\/00140139.2016.1261188","article-title":"Increasing surfboard volume reduces energy expenditure during paddling","volume":"60","author":"Ekmecic","year":"2017","journal-title":"Ergonomics"},{"key":"ref_24","unstructured":"Shimadzu (2019, April 25). AGS-X Series Universal Electromechanical Test Frames. Available online: https:\/\/www.shimadzu.com\/."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Michelena, A.H., Graham-Jones, J., Summerscales, J., and Hall, W. (2016). Eco-Friendly Flax Fibre\/Epoxy Resin\/Composite System for Surfboard Production, Springer.","DOI":"10.1007\/978-94-017-7515-1_20"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Shormann, D., Oggiano, L., and Panhuis, M.i.h. (2020). Numerical CFD Investigation of Shortboard Surfing: Fin Design vs. Cutback Turn Performance. Proceedings, 49.","DOI":"10.3390\/proceedings2020049132"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1016\/j.jfluidstructs.2019.07.006","article-title":"Computational hydrodynamics of a typical 3-fin surfboard setup","volume":"90","author":"Falk","year":"2019","journal-title":"J. Fluids Struct."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Falk, S., Kniesburges, S., Janka, R., O\u2019Keefe, T., Grosso, R., and D\u00f6llinger, M. (2020). Numerical investigation of the hydrodynamics of changing fin positions within a 4-fin surfboard configuration. Appl. Sci., 10.","DOI":"10.3390\/app10030816"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Oggiano, L., and Pierella, F. (2018). CFD for Surfboards: Comparison between Three Different Designs in Static and Maneuvering Conditions. Proceedings, 2.","DOI":"10.3390\/proceedings2060309"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Carswell, D., Lavery, N., and Brown, S. (2006). Computational modelling of surfboard fins for enhanced performance. The Engineering of Sport 6, Springer.","DOI":"10.1007\/978-0-387-46050-5_75"},{"key":"ref_31","unstructured":"Axli (2019, May 15). Torflex. Available online: https:\/\/www.surftorflex.com."},{"key":"ref_32","unstructured":"OVAM (2019, February 10). Ecolizer. Available online: http:\/\/www.ecodesignlink.be\/en\/about-us."},{"key":"ref_33","unstructured":"Ecoinvent (2019). Ecoinvent Data Base, Technical Report; Ecoinvent. Available online: https:\/\/ecoinvent.org\/."},{"key":"ref_34","unstructured":"(2019, February 25). SimaPro. Available online: https:\/\/simapro.com\/."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1166\/jbmb.2011.1116","article-title":"Environmental impact analysis of the production of flax fibres to be used as composite material reinforcement","volume":"5","author":"Davies","year":"2011","journal-title":"J. Biobased Mater. Bioenergy"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Chard, J.M., Basson, L., Creech, G., Jesson, D.A., and Smith, P.A. (2019). Shades of green: Life cycle assessment of a urethane methacrylate\/unsaturated polyester resin system for composite materials. Sustainability, 11.","DOI":"10.3390\/su11041001"},{"key":"ref_37","unstructured":"N\u00f3voa, P.J.R.O., Arteiro, A.J.C., and Marques, A.T. (2018, January 24\u201328). Modified expanded cork core sandwich structure with improved performance. Proceedings of the ECCM 2018-18th European Conference on Composite Materials."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1007\/s00107-015-0908-y","article-title":"Mechanical strength properties of innovative sandwich panels with expanded cork agglomerates","volume":"73","author":"Lakreb","year":"2015","journal-title":"Eur. J. Wood Wood Prod."},{"key":"ref_39","unstructured":"Eurostat (2019, May 14). Greenhouse Gas Emission Statistics-Carbon Footprints. Available online: https:\/\/ec.europa.eu\/eurostat\/statisticsexplained\/index.php\/Greenhouse_gas_emission_statistics_-_carbon_footprints."},{"key":"ref_40","unstructured":"Sustainable Surf (2019, February 28). The Ecoboard Lifecycle Study. Available online: https:\/\/sustainablesurf.org\/2016\/06\/the-ecoboard-lifecycle-study\/."},{"key":"ref_41","first-page":"109","article-title":"Flexural Testing of Sustainable and Alternative Materials for Surfboard Construction, in Comparison to Current Industry Standard Materials","volume":"4","author":"Johnstone","year":"2011","journal-title":"Plymouth Stud. Sci."}],"container-title":["Sustainability"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2071-1050\/14\/2\/668\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:38:13Z","timestamp":1760362693000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2071-1050\/14\/2\/668"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,1,7]]},"references-count":41,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2022,1]]}},"alternative-id":["su14020668"],"URL":"https:\/\/doi.org\/10.3390\/su14020668","relation":{},"ISSN":["2071-1050"],"issn-type":[{"value":"2071-1050","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,1,7]]}}}