<?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">perfluoropolyether</topic></authority><related type="broader"><topic>polymers</topic></related><variant type="other"><topic>PFPE</topic></variant><variant type="other"><topic>perfluoropolyethers</topic></variant> <note xml:lang="en"><![CDATA[ A polymer featuring ether functionality, perfluoropolyether (PFPE) refers to one branch of a family of synthetic lubricants developed by DuPont, the oil form of the line commercially known as Krytox (TM). In a conservation context, it is used primarily for waterproofing stone. Its repellent powers also recommend it as an anti-graffiti agent. ]]></note></mads>