<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31373679</termId><termName>sodium hexametaphosphate</termName><termType>PT</termType><termNote><![CDATA[ Amorphous sodium polyphosphate used as water softener (marketed in powdered form as Calgon T and other copyrighted names), sequestering agent, and corrosion inhibitor. In conservation, sodium hexametaphosphate is used in the cleaning of wood, stone, textiles, and ceramics. ]]></termNote><termCreatedDate>2026-03-30 20:40:46</termCreatedDate><relation><relationType>UF</relationType><termId>31373680</termId><termName>hexametaphosphate, sodium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343447</termId><termName>sodium compounds</termName><termType>PT</termType></relation></term>  </Zthes>