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Characterization of Portuguese gypsums as raw materials for dermocosmetics

Published online by Cambridge University Press:  31 July 2019

Cristiana Costa ,
António Fortes ,
Fernando Rocha Open the ORCID record for Fernando Rocha [Opens in a new window] ,
Angela Cerqueira ,
Delfim Santos  and
Maria Helena Amaral
Cristiana Costa
Affiliation:
Aveiro University, GeoBioTec Research Centre, Geosciences Department, 3810-193 Aveiro, Portugal
António Fortes
Affiliation:
Rovuma University, Department of Earth Sciences, Nampula, Mozambique
Fernando Rocha*
Affiliation:
Aveiro University, GeoBioTec Research Centre, Geosciences Department, 3810-193 Aveiro, Portugal
Angela Cerqueira
Affiliation:
Aveiro University, GeoBioTec Research Centre, Geosciences Department, 3810-193 Aveiro, Portugal
Delfim Santos
Affiliation:
Porto University, Faculty of Pharmacy, Laboratory of Pharmaceutical Technology, Department of Drug Sciences, 4050-313 Porto, Portugal
Maria Helena Amaral
Affiliation:
Porto University, Faculty of Pharmacy, Laboratory of Pharmaceutical Technology, Department of Drug Sciences, 4050-313 Porto, Portugal
*
*E-mail: tavares.rocha@ua.pt
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Abstract

Portuguese gypsum deposits utilized by the cement industry were characterized mineralogically, chemically and technologically for possible application in dermocosmetics. The deposits studied (Loulé, Óbidos and Soure) correspond to small outcrops in diapiric anticline areas. In principle, they represent gypsites which are white, and generally of higher quality for traditional applications (e.g. white cement), or greyish, and generally not adequate for cements and mortars. The analytical methods used to characterize the materials were wet sieving and X-ray sedimentation, X-ray diffraction, X-ray fluorescence spectrometry and assessment of abrasiveness, plasticity, texturometrics (adhesivity and firmness), oil absorption and cooling rate. The Óbidos gypsum displayed greater mineralogical and chemical quality (almost pure calcium sulfate) and had a finer grain size (<63 μm), whereas Loulé and Soure gypsums contain mineralogical impurities (mainly quartz). The Óbidos gypsum shows good characteristics in general for application in dermocosmetics because of its absorption, plasticity, adhesivity, firmness and low abrasiveness.

Keywords

dermocosmeticsgypsumplasterPortugal
Type
Article
Information
Clay Minerals , Volume 54 , Issue 3 , September 2019 , pp. 277 - 281
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Asuman Turkmenoglu

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