<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31469738</termId><termName>polyvinyl formal</termName><termType>PT</termType><termNote><![CDATA[ A colorless, flexible thermoplastic resin produced by the condensation of polyvinyl alcohol with formaldehyde that is used as a structural adhesive. In conservation, plasticized polyvinyl formal film has been used to fill losses in ancient textiles.  ]]></termNote><termCreatedDate>2026-03-30 21:06:26</termCreatedDate><relation><relationType>UF</relationType><termId>31469739</termId><termName>formal, polyvinyl</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31455622</termId><termName>polyvinyl acetal</termName><termType>PT</termType></relation></term>  </Zthes>