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. 2021 Apr 5;13(7):1162. doi: 10.3390/polym13071162

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© 2021 by the authors.

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/).

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Limit oxygen index (LOI) and UL-94 test (a) epoxy matrix (EP) and EP-based composites, (b) the residue image of EP and EP-based composites, (c) UL-94 vertical burning test, digital photos of (d) neat EP, and (e) EP/PVSi-5.0. Reprinted with permission from F. Chu et al. [165] Copyright 2020 Elsevier.