<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31370617</termId><termName>gutta-percha</termName><termType>PT</termType><termNote><![CDATA[ The inspissated, milky juice of various trees of the Sapodilla family native to the Malaysian peninsula. It is a tough, pliable, moldable rubber-like material, although it lacks the elasticity of rubber and becomes brittle on exposure to air and sunlight. Gutta-percha vulcanizes with sulfur into a hard, waterproof material. From the late 1840s, it was widely used for golf balls, imitation leather, joints in doll limbs, electrical insulation (especially underwater cables), and dental fillings. The name gutta-percha was sometimes used for any dark-colored molding material. It sets faster than "caoutchouc," which must be heated far longer. ]]></termNote><termCreatedDate>2026-03-30 20:39:58</termCreatedDate><relation><relationType>UF</relationType><termId>31370618</termId><termName>gutta percha</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31339944</termId><termName>gum resin</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31370619</termId><termName>caoutchouc</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31370641</termId><termName>rubber</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31409119</termId><termName>Sapotaceae</termName><termType>PT</termType></relation></term>  </Zthes>