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Reference.org
Polyphenylene sulfide
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<p>Polyphenylene sulfide (PPS) is an organic <a href="/facts/Polymer/eF32E50K">polymer</a> consisting of <a href="/facts/Aromatic/wK0DzRY6">aromatic</a> rings linked by <a href="/facts/Thioether/GdyEz43f">sulfides</a>. <a href="/facts/Synthetic_fiber/VBcafhnY">Synthetic fiber</a> and <a href="/facts/Textile/PJrVeM5S">textiles</a> derived from this polymer resist <a href="/facts/Chemical/EWcXU41d">chemical</a> and thermal attack. PPS is used in <a href="/facts/Air_filter/NoYhpPye">filter</a> fabric for <a href="/facts/Coal/83kV3qxg">coal</a> <a href="/facts/Boiler/uPqTq0I6">boilers</a>, <a href="/facts/Paper/FUETwwKV">papermaking</a> <a href="/facts/Felt/o203V1n7">felts</a>, <a href="/facts/Electrical_insulation/SfSXkrh5">electrical insulation</a>, <a href="/facts/Film_capacitor/7lEg8cDJ">film capacitors</a>, specialty <a href="/facts/Synthetic_membrane/ImpnK6eH">membranes</a>, <a href="/facts/Gasket/gQ3bnuPK">gaskets</a>, and <a href="/facts/Seal_(mechanical)/fS9VcknS">packings</a>. PPS is the precursor to a <a href="/facts/Conductive_polymer/JbwFx9IL">conductive polymer</a> of the <a href="/facts/Semi-flexible_rod_polymer/hPl65cQP">semi-flexible rod polymer</a> family. The PPS, which is otherwise insulating, can be converted to the <a href="/facts/Semiconductor/zFf3mGTE">semiconducting</a> form by <a href="/facts/Oxidation/Pyd5RVcj">oxidation</a> or use of <a href="/facts/Dopant/DvChmeRL">dopants</a>. </p><p>Polyphenylene sulfide is an <a href="/facts/Engineering_plastic/0ERgmT9R">engineering plastic</a>, commonly used today as a <a href="/facts/High-performance_plastics/8gnCHMnL">high-performance thermoplastic</a>. PPS can be molded, extruded, or machined to tight tolerances. In its pure solid form, it may be opaque white to light tan in color. Maximum service temperature is 218 °C (424 °F). PPS has not been found to dissolve in any solvent at temperatures below approximately 200 °C (392 °F). </p><p>An easy way to identify the compound is by the metallic sound it makes when struck. </p>