<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31409925</termId><termName>hydroxyethyl cellulose</termName><termType>PT</termType><termNote><![CDATA[ A neutral cellulose derivative, hydroxyethyl cellulose (HEC) is a granular, water-soluble thermoplastic polymer used as an emulsifier, thickener and film former in many types of solutions. It is also used as a sizing material. ]]></termNote><termCreatedDate>2026-03-30 20:50:13</termCreatedDate><relation><relationType>UF</relationType><termId>31409926</termId><termName>HEC</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31409927</termId><termName>cellulose, hydroxyethyl</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31371022</termId><termName>cellulose ether</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31316771</termId><termName>cellulose</termName><termType>PT</termType></relation></term>  </Zthes>