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A set of comparative analyses comprising static and dynamic tests was established using specimens made of castor oil-based polyurethane reinforced by glass fibers, and epoxy reinforced by glass and cotton fibers. The manufacturing method and estimation of fiber volume fraction of the specimens were described in detail. Tensile and flexural tests were performed to evaluate the mechanical performance of the novel laminate. Fractographic post-mortem examinations assessed the quality of the fiber\u2013matrix interaction and allowed direct observation of the failure modes. Surface treatment of natural fibers appears necessary to improve the adhesion of the natural fibers to the matrix. Dynamic responses are discussed, considering natural frequencies and modal damping coefficients. In this context, the potentialities and the limitations of using the novel eco-friendly composite material as structural parts are discussed.<\/jats:p>","DOI":"10.1177\/0021998320911984","type":"journal-article","created":{"date-parts":[[2020,3,18]],"date-time":"2020-03-18T00:53:39Z","timestamp":1584492819000},"page":"3125-3142","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":16,"title":["Polyurethane derived from castor oil reinforced with long cotton fibers: Static and dynamic testing of a novel eco-friendly composite material"],"prefix":"10.1177","volume":"54","author":[{"given":"Romeu RC","family":"da Costa","sequence":"first","affiliation":[{"name":"UTFPR, Department of Mechanical Engineering, Parana Federal Technical University, Brazil"}]},{"given":"Eduardo S","family":"Sato","sequence":"additional","affiliation":[{"name":"EESC-USP, S\u00e3o Carlos School of Engineering, Department of Aeronautical Engineering, University of S\u00e3o Paulo, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5586-2500","authenticated-orcid":false,"given":"Marcelo L","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"EESC-USP, S\u00e3o Carlos School of Engineering, Department of Aeronautical Engineering, University of S\u00e3o Paulo, Brazil"}]},{"given":"Ricardo de","family":"Medeiros","sequence":"additional","affiliation":[{"name":"UDESC, Department of Mechanical Engineering, Santa Catarina State University, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6165-8899","authenticated-orcid":false,"given":"Andr\u00e9 FC","family":"Vieira","sequence":"additional","affiliation":[{"name":"UBI, University of Beira Interior, Electromechanical Engineering Department, Portugal"}]},{"given":"Rui M","family":"Guedes","sequence":"additional","affiliation":[{"name":"FEUP, Faculty of Engineering of University of Porto, Mechanical Engineering Department, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8199-1162","authenticated-orcid":false,"given":"Volnei","family":"Tita","sequence":"additional","affiliation":[{"name":"EESC-USP, S\u00e3o Carlos School of Engineering, Department of Aeronautical Engineering, University of S\u00e3o Paulo, Brazil"}]}],"member":"179","published-online":{"date-parts":[[2020,3,17]]},"reference":[{"key":"bibr1-0021998320911984","doi-asserted-by":"publisher","DOI":"10.1002\/pc.21224"},{"key":"bibr2-0021998320911984","doi-asserted-by":"publisher","DOI":"10.1016\/j.matdes.2014.06.058"},{"key":"bibr3-0021998320911984","doi-asserted-by":"publisher","DOI":"10.1007\/s11837-006-0234-2"},{"key":"bibr4-0021998320911984","doi-asserted-by":"publisher","DOI":"10.1080\/09535310903541298"},{"key":"bibr5-0021998320911984","first-page":"12","volume":"44","author":"Arenas JP","year":"2010","journal-title":"Sound Vib"},{"key":"bibr6-0021998320911984","first-page":"676","volume":"19","author":"Bahareh Z","year":"2014","journal-title":"J Ind Ecol"},{"key":"bibr7-0021998320911984","doi-asserted-by":"publisher","DOI":"10.3390\/coatings5030527"},{"key":"bibr8-0021998320911984","doi-asserted-by":"publisher","DOI":"10.1016\/j.proeng.2016.05.056"},{"key":"bibr9-0021998320911984","doi-asserted-by":"crossref","unstructured":"Jayasinghe Y, Jayaweera C, Botheju R, et\u00a0al. 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