{"id":2684,"date":"2015-03-27T22:29:32","date_gmt":"2015-03-27T22:29:32","guid":{"rendered":"http:\/\/cool.conservation-us.org\/cool\/osg\/?page_id=2684"},"modified":"2020-04-20T20:46:49","modified_gmt":"2020-04-20T20:46:49","slug":"laduc","status":"publish","type":"page","link":"https:\/\/resources.culturalheritage.org\/osg-postprints\/v20\/laduc\/","title":{"rendered":"A comparison of fumed silica and precipitated silica as matting agents for acrylic paint"},"content":{"rendered":"<p><em>Elizabeth La Duc and Dr. Aaron Shugar<\/em><\/p>\n<h4>Abstract<\/h4>\n<p>The use of matte paint is often required in conservation for successful inpainting. A matte surface can be achieved in several ways, for example, by using a paint with a high pigment concentration, by abrading the surface to increase roughness, or by adding a matting agent to the paint. While fumed silica is often used as a matting agent by conservators, its efficacy has been called into question. Fumed silica is produced commercially as a thickening or thixotropic agent, not as a matting agent; in contrast, precipitated silica is sold specifically as a matting agent. Paint samples modified with fumed silica (CAB-O-SIL M-5, Cabot Corporation) and precipitated silica (ACEMATT HK 125, Evonik Degussa) were compared with gloss analysis, colorimetry, and differential scanning calorimetry (DSC). In addition, the characteristics of a commercially available matte acrylic emulsion paint were investigated. Precipitated silica was found to be easier to use than fumed silica and nearly as effective at reducing gloss, with a 1% addition to paint reducing gloss by over 60%. Commercially available matte paint was found to be glossier than expected or desired, reinforcing the importance of understanding and testing one&#8217;s materials.<\/p>\n\n\n<h6 class=\"wp-block-heading\"><strong><a href=\"http:\/\/resources.culturalheritage.org\/osg-postprints\/postprints\/v20\/\">2013 | Indianapolis | Volume 20<\/a><\/strong><\/h6>\n","protected":false},"excerpt":{"rendered":"<p>Elizabeth La Duc and Dr. Aaron Shugar Abstract The use of matte paint is often required in conservation for successful inpainting. A matte surface can be achieved in several ways, for example, by using a paint with a high pigment concentration, by abrading the surface to increase roughness, or by adding a matting agent to [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":0,"parent":2625,"menu_order":13,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2684","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/pages\/2684","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/comments?post=2684"}],"version-history":[{"count":0,"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/pages\/2684\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/pages\/2625"}],"wp:attachment":[{"href":"https:\/\/resources.culturalheritage.org\/osg-postprints\/wp-json\/wp\/v2\/media?parent=2684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}