<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">silicone</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31370966</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:40:02</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">silicone resin</dcterms:alternative> <dcterms:alternative xml:lang="en">silicone, thermoset</dcterms:alternative> <dcterms:alternative xml:lang="en">silicones</dcterms:alternative> <dcterms:alternative xml:lang="en">thermoset silicone</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ 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. ]]></dc:description></metadata>