柔性绝缘套管第3部分:各种套管规格343至345:可扩展编织乙烯氯三氟乙烯（e-ctfe）纺织套管 无涂层

[中文适用范围]： 本国际标准规定了具有在纵向压缩时扩大内径，并在压缩力释放后恢复至初始内径特性的套管的要求。这种可膨胀编织纺织品套管，无涂层，由经适当处理的氯化乙烯三氟乙烯（E-CTFE）单丝纱线制成，以提供上述机械性能。这些套管适用于高达 155 °C 的温度。该套管通常提供内径在 6 mm 至 63 mm 之间，并具有三种壁厚等级（薄壁（第 343 页）、中壁（第 344 页）和厚壁（第 345 页））。通常提供的颜色如下：黑色、白色、棕色、红色、橙色、黄色、绿色、蓝色、灰色和自然色。由于其多孔结构，该套管通常用于提供空气间隙绝缘。因此，本标准未规定击穿电压要求。（该特性的任何值应在采购合同中给出，典型值为 1.5 kV/mm 壁厚，但不能假设存在线性关系。）然而，它用于为电路组件（如导线、套管和扁平电缆）提供机械保护，这些组件被作为包裹层或束带套在该套管上。符合该规格的材料满足既定的性能水平。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，而不仅仅基于该规格。 [外文原描述]： Gives the requirements for sleeving having the property of expanding its internal diameter when compressed longitudinally and thereafter returning to its initial diameter after release of the compressing force. This expandable braided textile sleeving, uncoated, is constructed of ethylene chlorotrifluoroethylene (E-CTFE) monofilament yarns suitably processed to provide the mechanical ability to conform in the manner described above. These sleevings have been found suitable for use at temperatures up to 155 °C. This sleeving is normally supplied in internal diameters between 6 mm and 63 mm and in three levels of wall thickness (thin (sheet 343), medium (sheet 344), and thick (sheet 345)). Because of its open construction, this sleeving is normally used to provide air-space insulation. Therefore, no requirement for breakdown voltage is specified in this standard. (Any value for this property should be given in the purchase contract, but a typical value is 1,5 kV/mm wall thickness, although a linear relationship cannot be assumed.) However, it serves to provide mechanical protection to circuit components such as wires, sleeves, and flat cable over which it is applied as a containing wrap or harness. 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.