<?xml version="1.0" encoding="utf-8"?><rdf:RDF  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"  xmlns:skos="http://www.w3.org/2004/02/skos/core#"  xmlns:map="http://www.w3c.rl.ac.uk/2003/11/21-skos-mapping#"  xmlns:dct="http://purl.org/dc/terms/"  xmlns:dc="http://purl.org/dc/elements/1.1/"><skos:ConceptScheme rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_en">  <dc:title>Tesaurus d&apos;Art i Arquitectura</dc:title>  <dc:creator>Getty Institute</dc:creator>  <dc:contributor></dc:contributor>  <dc:publisher></dc:publisher>  <dc:rights></dc:rights>  <dc:subject></dc:subject>  <dc:description><![CDATA[  ]]></dc:description>  <dc:date>0000-00-00</dc:date>  <dct:modified>2024-01-24 15:40:44</dct:modified>  <dc:language>en</dc:language>  </skos:ConceptScheme>  <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31370966"><skos:prefLabel xml:lang="en">silicone</skos:prefLabel><skos:notation>300014558</skos:notation><skos:altLabel xml:lang="en">silicone resin</skos:altLabel><skos:altLabel xml:lang="en">silicone, thermoset</skos:altLabel><skos:altLabel xml:lang="en">silicones</skos:altLabel><skos:altLabel xml:lang="en">thermoset silicone</skos:altLabel> <skos:scopeNote xml:lang="en">Any solid semi-inorganic polymers based on siloxanes, obtained by the action of concentrated hydrochloric acid on calcium silicide. Silicones were first discovered by F.S. Kipping in England in 1904, but were not commercially produced as polymers until 1943 by Dow Corning and 1946 by General Electric. They were called silicones because their empirical formula (R2SiO) is similar to that for ketones (R2CO). Silicones can be liquids, gels, and elastomers as well as solid thermoplastic or thermosetting resins. In general, they have excellent heat and chemical resistance and are water repellent. Silicones are used as adhesives, lubricants, protective coatings, release agents, paints, rubbers, coolants, implants, and insulation.</skos:scopeNote><skos:inScheme rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en"/><skos:related rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31410802"/><skos:broader rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31340156"/><skos:exactMatch> <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_es/index.php?tema=14084047"> <skos:prefLabel xml:lang="es">silicona</skos:prefLabel> </skos:Concept></skos:exactMatch><skos:exactMatch> <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_ca/index.php?tema=9846787"> <skos:prefLabel xml:lang="ca">silicona</skos:prefLabel> </skos:Concept></skos:exactMatch>  <dct:created>2026-03-30 20:40:02</dct:created>  </skos:Concept></rdf:RDF>