<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31374975</termId><termName>fused silica glass</termName><termType>PT</termType><termNote><![CDATA[ One of the most transparent and heat-resistant of all glasses and is 100% silicon dioxide. ]]></termNote><termCreatedDate>2026-03-30 20:41:07</termCreatedDate><relation><relationType>UF</relationType><termId>31374976</termId><termName>fused quartz</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31374977</termId><termName>glass, fused silica</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31374978</termId><termName>quartz glass</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31374979</termId><termName>silica glass</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31374980</termId><termName>silica glass, fused</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31344443</termId><termName>glass by composition or origin</termName><termType>PT</termType></relation></term>  </Zthes>