柔性绝缘套管 - 第3部分:各种类型套管的规格 - 板材240至243:热收缩PTFE套管

[中文适用范围]： 这些IEC 60684-3的页面给出了聚四氟乙烯（PTFE）热缩管（低收缩比和高收缩比）的要求。通常提供的膨胀内径尺寸最大为12毫米，分为三种壁厚范围，适用于低收缩比类型（页面240、241和242）；高收缩比类型（页面243）的壁厚最大为100毫米。通常提供乳白色透明至浅棕色的颜色，最低回缩温度为350°C。IEC 60216-1中描述的用于评估热耐久性的程序不直接适用于PTFE；然而，产品性能的经验表明，该套管可用于温度高达250°C的系统中。除本规范中具体列出的尺寸外，其他尺寸也可作为定制产品提供。如果这些产品符合表3和表4中列出的性能要求，则应视为符合本规范。符合本规范的材料达到了既定的性能水平。然而，用户为特定应用选择材料时，应基于该应用获得满意性能所需的实际要求，而不应仅基于本规范。 [外文原描述]： Gives the requirements for heat-shrinkable (low and high shrink ratio) polytetrafluorethylene (PTFE) sleeving. It is normally available in expanded internal diameter sizes up to 12 mm in three wall thickness ranges as supplied in the low shrink ratio (sheets 240, 241 and 242) and up to 100 mm in one wall thickness range as supplied in the high shrink ratio (sheet 243). It is normally available in transparent milk white to light tan in colour and the minimum recovery temperature is 350 °C. The procedures described in IEC 60216-1 for evaluation of thermal endurance are not readily applicable to PTFE: however, experience of product performance indicates that this sleeving may be suitable for inclusion in systems for operation at temperatures up to 250°C. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone.