问题请教...

<p>&nbsp;</p>
<p>请教各位，弱电产品防潮防高温如何来处理？谢谢！</p>

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我也不知道 看看书吧

<p>应该根据环境选择线缆，选择管道吧。</p>
<p>&nbsp;</p>
<p>&nbsp; </p>
<p>表2.9.2-2聚氯乙烯(evc-u)单孔管的物理及机械性能</p>
<p>
<table cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td valign="top" width="35">
<p>序号</p></td>
<td valign="top" width="319" colspan="3">
<p>指标名称</p></td>
<td valign="top" width="53">
<p>单位</p></td>
<td valign="top" width="170">
<p>指标</p></td></tr>
<tr>
<td valign="top" width="35">
<p>1</p></td>
<td valign="top" width="319" colspan="3">
<p>比重</p></td>
<td valign="top" width="53">
<p>g／cm</p></td>
<td valign="top" width="170">
<p>1.4～1.6</p></td></tr>
<tr>
<td valign="top" width="35" rowspan="2">
<p>2</p><br/></td>
<td valign="top" width="49" rowspan="2">
<p>腐蚀度</p><br/></td>
<td valign="top" width="270" colspan="2">
<p>(在盐酸及硝酸中泡渍5h)</p></td>
<td valign="top" width="53">
<p>g／cm</p></td>
<td valign="top" width="170">
<p>≤±2.0</p></td></tr>
<tr>
<td valign="top" width="270" colspan="2">
<p>(在硫酸及氢氧化钠中泡渍5h)</p></td>
<td valign="top" width="53"><br/></td>
<td valign="top" width="170">
<p>≤±1.5</p></td></tr>
<tr>
<td valign="top" width="35">
<p>3</p></td>
<td valign="top" width="319" colspan="3">
<p>60+2℃液压(允许应力130kgf／cm2)</p></td>
<td valign="top" width="53"><br/></td>
<td valign="top" width="170">
<p>保持1h，不破裂，不渗漏</p></td></tr>
<tr>
<td valign="top" width="35">
<p>4</p></td>
<td valign="top" width="319" colspan="3">
<p>20+2℃液压(允许应力350kgf／cm2)</p></td>
<td valign="top" width="53"><br/></td>
<td valign="top" width="170">
<p>保持1h，不破裂，不渗漏</p></td></tr>
<tr>
<td valign="top" width="35" rowspan="2"><br/></td>
<td valign="top" width="98" colspan="2" rowspan="2">
<p>140℃情况下尺寸变化率</p></td>
<td valign="top" width="221">
<p>沿长度方向</p></td>
<td valign="top" width="53">
<p>％</p></td>
<td valign="top" width="170">
<p>≤±4.0</p></td></tr>
<tr>
<td valign="top" width="221">
<p>径向</p></td>
<td valign="top" width="53">
<p>％</p></td>
<td valign="top" width="170">
<p>≤±2.5</p></td></tr>
<tr>
<td valign="top" width="35">
<p>6</p></td>
<td valign="top" width="319" colspan="3">
<p>扁平实验(压至外径的i／z)外径≤200mm按此标准</p></td>
<td valign="top" width="53"><br/></td>
<td valign="top" width="170">
<p>无裂缝和破裂现象</p></td></tr>
<tr>
<td valign="top" width="35">
<p>7</p></td>
<td valign="top" width="319" colspan="3">
<p>线膨胀系数</p></td>
<td valign="top" width="53">
<p>1／℃</p></td>
<td valign="top" width="170">
<p>6×10^-5～8×10^-5</p></td></tr>
<tr>
<td valign="top" width="35">
<p>8</p></td>
<td valign="top" width="319" colspan="3">
<p>.抗拉强度(20℃时)</p></td>
<td valign="top" width="53">
<p>MPa</p></td>
<td valign="top" width="170">
<p>39.227～58.84</p></td></tr>
<tr>
<td valign="top" width="35">
<p>9</p></td>
<td valign="top" width="319" colspan="3">
<p>拉弯强度(20℃时)</p></td>
<td valign="top" width="53">
<p>MPa</p></td>
<td valign="top" width="170">
<p>78.453～117.68</p></td></tr>
<tr>
<td valign="top" width="35">
<p>10</p></td>
<td valign="top" width="319" colspan="3">
<p>抗压强度(20℃时)</p></td>
<td valign="top" width="53">
<p>MPa</p></td>
<td valign="top" width="170">
<p>68.647～156.906</p></td></tr>
<tr>
<td valign="top" width="35">
<p>11</p></td>
<td valign="top" width="319" colspan="3">
<p>抗剪强度(20℃时)</p></td>
<td valign="top" width="53">
<p>MPa</p></td>
<td valign="top" width="170">
<p>39.227以上</p></td></tr>
<tr>
<td valign="top" width="35">
<p>12</p></td>
<td valign="top" width="319" colspan="3">
<p>冲击、韧性(无缺口)(20℃时)</p></td>
<td valign="top" width="53">
<p>MPa</p></td>
<td valign="top" width="170">
<p>11.768～17.652</p></td></tr></tbody></table></p>

[此贴子已经被作者于2010-1-6 10:11:11编辑过]

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