<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">polypropylene</topic></authority><related type="broader"><topic>thermoplastic</topic></related><related type="broader"><topic>polyolefin</topic></related><variant type="other"><topic>PP</topic></variant><variant type="other"><topic>propylene resin</topic></variant><variant type="other"><topic>resin, propylene</topic></variant> <note xml:lang="en"><![CDATA[ Tough, lightweight, rigid plastic made by the polymerization of high-purity propylene gas in the presence of an organometallic catalyst at relatively low pressure and temperature. ]]></note></mads>