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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Making the specimens P13–P24 by mixing the binder with fibres: (a) fibres cut to size; (b,c) sprinkling binder over fibres; (d,e) wrapping the fibres-binder assembly; (f) resulting layers.