<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31373535</termId><termName>sodium polyacrylate</termName><termType>PT</termType><termNote><![CDATA[ A super-absorbent polymer, the sodium salt of polyacrylic acid, with broad commercial applications. In a conservation context, it is used as a moisture buffer material for humidity control in museum exhibit cases and in historic structures. ]]></termNote><termCreatedDate>2026-03-30 20:40:44</termCreatedDate><relation><relationType>UF</relationType><termId>31373536</termId><termName>polyacrylate, sodium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343447</termId><termName>sodium compounds</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31343235</termId><termName>polymers</termName><termType>PT</termType></relation></term>  </Zthes>