<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31320293</termId><termName>hydrofluoric acid</termName><termType>PT</termType><termNote><![CDATA[ A highly corrosive, caustic, and toxic water solution of hydrogen fluoride that dissolves most metals, except gold, platinum, glass, ceramics, and organic material; used for etching glass and cleaning metals. ]]></termNote><termCreatedDate>2026-03-30 20:26:19</termCreatedDate><relation><relationType>UF</relationType><termId>31320294</termId><termName>acid, hydrofluoric</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31306060</termId><termName>acid</termName><termType>PT</termType></relation></term>  </Zthes>