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. 2020 Dec 3;13(23):5509. doi: 10.3390/ma13235509

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Shielding effectiveness versus frequency for cement plaster containing only sand and for plasters containing manganese-zinc ferrite powders (sample 5CHY13) and manganese dioxide powders (sample 5EMD) [63].