<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343406</termId><termName>propylene oxide</termName><termType>PT</termType><termNote><![CDATA[ Colorless, extremely volatile liquid once primarily used as racing fuel but now banned for safety reasons. Propylene oxide is chiefly used in production of polyurethane plastics. It is also employed as a fumigant for use in agriculture and cultural heritage protection. ]]></termNote><termCreatedDate>2026-03-30 20:32:37</termCreatedDate><relation><relationType>UF</relationType><termId>31343407</termId><termName>oxide, propylene</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>