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<p>and <a href="page.php?w=Chemical_polarity">non-polar</a>. Its properties are similar to <a href="page.php?w=polyethylene">polyethylene</a>, but it is slightly harder and more heat-resistant. It is a white, mechanically rugged material and has a high chemical resistance.</p>

<p>Polypropylene is the second-most widely produced <a href="page.php?w=Commodity_plastics">commodity plastic</a> (after <a href="page.php?w=polyethylene">polyethylene</a>).</p>

<p><big>History</big></p>
<p><a href="page.php?w=Phillips_Petroleum">Phillips Petroleum</a> chemists <a href="page.php?w=J._Paul_Hogan">J. Paul Hogan</a></p><p>
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