<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31370902</termId><termName>polystyrene</termName><termType>PT</termType><termNote><![CDATA[ A clear plastic or stiff foam, a polymer of styrene, used chiefly as an insulator in refrigerators, air conditioners, and for packaging. ]]></termNote><termCreatedDate>2026-03-30 20:40:02</termCreatedDate><relation><relationType>UF</relationType><termId>31370903</termId><termName>PS</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31370904</termId><termName>resin, styrene</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31370905</termId><termName>styrene resin</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31340150</termId><termName>thermoplastic</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31299305</termId><termName>Styrofoam (TM)</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31316656</termId><termName>storax</termName><termType>PT</termType></relation></term>  </Zthes>