xuchaowei:
XLPE与XLPVC按ul标准伸长率测试速度是多少？请各位大侠指教。

XLPVC老化前的伸长率为150%(外被和绝缘),老化后残率值跟温度等级,用途有关;

XLPE绝缘老化前伸长率为300%,老化后的残率跟随温度等级,用途的不同而不同;

XLPE外被老化前伸长率为150%,老化后的残率取决于温度等级跟,用途.

以上观点是在查了UL1581,UL444,UL62标准下的结论.一般情况下,不同的UL标准对同一种物料的物理性能要求会有差别,特别是老化条件跟老化后的值是不一样的.

3楼的可以说下   伸长率测试速度是多少   吗？在1581里面有的是没有具体注明的！

如果找统一的  在哪可以找到啊！要不你和我们直接指导下？

goleye:

3楼的可以说下   伸长率测试速度是多少   吗？在1581里面有的是没有具体注明的！

如果找统一的  在哪可以找到啊！要不你和我们直接指导下？

8.5mm/s见UL2556.

The elongation and tensile strength tests shall be conducted simultaneously at ROOM TEMPERATURE.
The specimen shall be conditioned at ROOM TEMPERATURE for at least 30 min prior to testing. Video,
laser, or mechanical extensometers or a scale method shall be used to determine elongation. When other
than a mechanical extensometer is used, two gauge marks, 25 mm (1 in) apart and equidistant from the
center of the specimen, shall be placed on the specimen. These gauge marks shall be at right angles to
the direction of pull in the testing machine and as narrow as possible, to facilitate measurement. The
specimen shall be completely at rest while being marked. The specimen shall be clamped in position, with
25 mm (1 in) gauge marks between the grips so that the section between the gauge marks is straight but
not under tension. The distance between a gauge mark and the adjacent grip shall not exceed 13 mm (0.5
in). The grips shall be separated at a uniform rate until the specimen ruptures. The rate of separation shall
be 8.5 mm/s (20 in/min) unless specified otherwise in the product standard. During the separation of the
jaws, the distance between the gauge marks shall be measured continuously so that the distance at the
instant of rupture can be recorded to within 2 mm (0.1 in). The maximum load before break, W, shall be
recorded to the nearest 0.5 N (0.1 lbf). If the specimen breaks outside of the gauge marks or the grips of
the mechanical extensometer at a value below that specified as the acceptable minimum, the test results
shall be disregarded and the test shall be repeated with another specimen.

goleye:
5楼的大哥  可以给我发个UL2556的电子档不！不要上传，穷人啊！gc03@cntition.com

已经发给你了.不用客气.

老大，如何测试XLPE的耐温及耐压？比如：UL3321,XLPE电子线，是标示：150度，600V，作为用户，如何测试这个基本指标？