ÿþ<html><!-- InstanceBegin template="/Templates/nav.dwt" codeOutsideHTMLIsLocked="false" --> <head> <!-- InstanceBeginEditable name="doctitle" --> <title>Natural Polyurethanes - Harkness Industries</title> <!-- InstanceEndEditable --> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <!-- Fireworks MX Dreamweaver MX target. 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HREF="news.htm">NEWS</a> | <a HREF="order.htm">PLACE AN ORDER</a> | <a HREF="contact.htm">CONTACT US</a>&nbsp;</div></td> <td><img SRC="images/spacer.gif" width="1" height="19" border="0" alt=""></td> </tr> <tr> <td BACKGROUND="images/nav_r3_c2.jpg"><img name="nav_r3_c2" SRC="images/nav_r3_c2.jpg" width="150" height="6" border="0" alt=""></td> <td><img name="nav_r3_c3" SRC="images/nav_r3_c3.jpg" width="600" height="6" border="0" alt=""></td> <td rowspan="2" valign="top" BACKGROUND="images/rtspcr.jpg"><img name="nav_r3_c4" SRC="images/nav_r3_c4.jpg" width="10" height="448" border="0" alt=""></td> <td><img SRC="images/spacer.gif" width="1" height="6" border="0" alt=""></td> </tr> <tr> <td width="150" valign="top" BACKGROUND="images/nav_r4_c2.jpg"><table width="100%" border="0" align="center"> <tr> <td width="10%" valign="top"><div align="right"><img SRC="images/arrow.gif" width="9" height="10"></div></td> <td width="90%" class="sideLinks"><a HREF="custom_urethane.htm">CUSTOM URETHANE CAPABILITIES</a></td> </tr> <tr> <td colspan="2"><img SRC="images/vline.jpg" width="100%" height="1"></td> </tr> <tr> <td valign="top"><div align="right"><img SRC="images/arrow.gif" width="9" height="10"></div></td> <td valign="top" class="sideLinks"><a HREF="stock_urethane.htm">STANDARD URETHANE SHAPES</a> </td> </tr> <tr> <td colspan="2"><img SRC="images/vline.jpg" width="100%" height="1"></td> </tr> <tr> <td valign="top"><div align="right"><img SRC="images/arrow.gif" width="9" height="10"></div></td> <td class="sideLinks"><a HREF="injection_molding.htm">INJECTION MOLDING</a></td> </tr> <tr> <td colspan="2"><img SRC="images/vline.jpg" width="100%" height="1"></td> </tr> <tr> <td valign="top"><div align="right"><img SRC="images/arrow.gif" width="9" height="10"></div> </td> <td class="sideLinks"><a HREF="profile_extrusion.htm">PROFILE EXTRUSION</a></td> </tr> <tr> <td colspan="2"><img SRC="images/vline.jpg" width="100%" height="1"></td> </tr> <tr> <td valign="top"><div align="right"><img SRC="images/arrow.gif" width="9" height="10"></div> </td> <td class="sideLinks"><a HREF="Technical_Information.htm">TECHNICAL INFORMATION</a> <table width="100%" border="0"> <tr> <td width="8%"><img SRC="images/arrow.gif" width="9" height="10"></td> <td width="92%"><a HREF="pdfs/saftey_sheet.pdf" target="_blank" class="tinytype">MSDS</a></td> </tr> <tr> <td width="8%"><img SRC="images/arrow.gif" width="9" height="10"></td> <td width="92%"><a HREF="tech-sheets.htm" class="tinytype">Technical Data Sheets</a></td> </tr> <tr> <td width="8%"><img SRC="images/arrow.gif" width="9" height="10"></td> <td width="92%"><a HREF="pdfs/Guide-Machining.pdf" target="_blank" class="tinytype">Machining Polyurethane</a></td> </tr> <tr> <td width="8%"><img SRC="images/arrow.gif" width="9" height="10"></td> <td width="92%"><a HREF="pdfs/Product_Guide.pdf" target="_blank" class="tinytype">Urethane Selector Guide</a></td> </tr> <tr> <td width="8%"><img SRC="images/arrow.gif" width="9" height="10"></td> <td width="92%"><a HREF="NaturalUrethane.htm" class="tinytype">Natural Urethane Color</a></td> </tr> </table> </table></td> <td width="600" valign="top" bgcolor="#FFFFFF"><table width="95%" border="0" align="center"> <tr> <td style="width: 566px"><!-- InstanceBeginEditable name="content" --> <p class="pageheader">Natural Polyurethanes</p> <p><span class="header3">Why Does Color Vary in Natural Polyurethanes?</span><br /> Natural polyurethanes vary from a light tan (almost yellow) to a medium-dark amber (almost greenish). This variation is noticed from supplier to supplier, and even within a given supplier s production. Black or other colored (pigmented) polyurethanes do not typically exhibit this variability in color. It is important to note that these color variations have no impact on the chemical or physical properties of the polyurethane.<br /><br /> This variation in appearance is most often due to inherent variations in the prepolymer or amine curative components, durometer of the finished polyurethane, or the conditions during the storage, handling and processing of the components into polyurethanes. The appearance will further change with exposure to ambient UV radiation and with age.<br /><br /> Variations in appearance may be attributed to one or more of the following variables:<br /><br /> <li>Color contributions from the base urethane raw materials- prepolymer, curative and &nbsp;&nbsp;&nbsp;&nbsp;other additives</li> <li>Shape of the polyurethane part: thickness and geometry</li> <li>Durometer of the urethane</li> <li>Processing conditions of the components into polyurethane</li> <li>Exposure to UV light as the part ages</li> <br /><br />Given that appearance is a function of so many variables, it becomes impractical to establish a specific color specification.<br /><br /> If inherent variation in polyurethane s natural color may be a concern, Harkness recommends utilizing black polyurethane, which is provided at no additional cost.<br /><br /> If you have any further questions regarding color or any other technical matter related to cast polyurethanes, please do not hesitate to contact us here at Harkness Industries.<br /> </p> </td> </tr> <tr> <td height="20" style="width: 566px"><div align="center"><a HREF="contact.htm" class="cat">Contact Us With Your Product Requirements Today!</a></div></td> </tr> </table></td> <td><img SRC="images/spacer.gif" width="1" height="442" border="0" alt=""></td> </tr> <tr> <td colspan="3" BACKGROUND="images/nav_r5_c2.jpg"><div align="right" class="footer"><a HREF="index.htm">HOME</a> | <a HREF="about_us.htm">ABOUT US </a>| <a HREF="news.htm">NEWS</a> |<a HREF="order.htm"> PLACE AN ORDER</a> | <a HREF="contact.htm">CONTACT US</a></div></td> <td><img SRC="images/spacer.gif" width="1" height="41" border="0" alt=""></td> </tr> <tr> <td colspan="3" valign="middle" BACKGROUND="images/nav_r6_c2.jpg"><div align="center" class="address"> <p><span class="bold">Harkness Industries</span><br> <span class="bold">1-800-343-4275 &#8226; </span>Phone: 203-272-3219 &#8226; Fax: 203-272-0428<br> 50 Grandview Court &#8226; Cheshire, CT 06410<br> </p> </div></td> <td><img SRC="images/spacer.gif" width="1" height="16" border="0" alt=""></td> </tr> <tr> <td>&nbsp;</td> <td colspan="3"><div align="right"><font size="1">&copy;2006 Harkness Industries. 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