1, thermal shrinkmaterials: plastic ized high polymer or polymer alloy as the substrate, with high-energy irradiation methodor or chemical method to make the polymer molecular chain part of the cross-linking into a mesh structure to obtain elastic "memory effect", after heating expansion to a specific size after cooling stereotypes, so that when heated to the appropriate temperature after self-shrink to the shape and size before expansion, This material is called a heat shrink material.

2, heat shrink sleeve: the above-mentioned high polymer or polymer alloy by extrusion molding to obtain a specified size of tubular intermediate products, irradiated (or chemical) after cross-linking heating expansion, cooling training with a certain size of tubular products become heat shrink casing.

3, the definition of copper drain heat shrink tube hot and cold shock test

The cold and cold shock test, also known as the temperature shock test or the high and low temperature impact test, is used to assess the adaptability of the copper discharge heat shrink tube to the rapid change of ambient temperature, is an indispensable test in the routine test of the batch production stage, and in some cases can also be used for environmental stress screening test. It can be said that the frequency applied in the hot and cold shock test box in verifying and improving the environmental adaptability of copper discharge shrink tube is second only to the vibration and high and low temperature test.

4, common implementation standards

(1) GJB 150-86 Environmental Test Method for Military Equipment

(2) GB 2423 "Basic Environmental Test Ingenies of Electrical and Electronic Products"

(3) U.S. Army standard MIL-STD-810F "Environmental Engineering Considerations and Laboratory Tests"

5, the purpose of the hot and cold shock test

In fact, as a tool, the purpose of the hot and cold shock test box is different when applied at different stages of product development:

(1) The engineering development stage can be used to find the design and process defects of copper drain heat shrink tube;

(2) The basis for the decision-making of copper-drained heat shrink tube or design appraisal and approval stage;

(3) As an environmental stress screening application, the purpose is to eliminate the early failure of copper exhaust heat shrink tube.

Therefore, when preparing environmental test outlines or screening outlines for different stages of the development process, test reports or screening reports, the purpose of the test seistic tests for hot and cold shock tests is materialized and should not be expressed vaguely or generally.

铜排热缩管冷热冲击测试
1、热收缩材料：以可塑性线型高聚物或高聚物合金为基材，用高能辐照方法或化学方法使聚合物分子 链部分交联成为网状结构获得弹性“记忆效应”，经加热扩张至特定尺寸后冷却定型，使 用时加热到适当温度后自行收缩到扩张前的形状和尺寸，这种材料称为热收缩材料。
2、热收缩套管：将上述高聚物或高聚物合金通过挤出成型得到规定尺寸的管状中间产品，辐照（或化学）交联后加热扩张，冷却定型得到的具有一定尺寸的管状产品成为热收缩套管。
3、铜排热缩管冷热冲击试验的定义
冷热冲击试验又名温度冲击试验或高低温冲击试验，是用于考核铜排热缩管对周围环境温度急剧变化的适应性，是批产阶段的例行试验中不可缺少的试验，在有些情况下也可以用于环境应力筛选试验。可以说冷热冲击试验箱在验证和提高铜排热缩管的环境适应性方面应用的频度仅次于振动与高低温试验。
4、常见的执行标准
    （1）GJB 150-86《军用设备环境试验方法》
    （2）GB 2423《电工电子产品基本环境试验规程》
    （3）美军标MIL－STD－810F《环境工程考虑和实验室试验》
 5、冷热冲击试验的目的
    实际上冷热冲击试验箱作为一种工具，应用在产品研制的不同阶段时的目的是不同的：
   （1）工程研制阶段可用于发现铜排热缩管的设计和工艺缺陷；
   （2）铜排热缩管定型或设计鉴定和批产阶段验收决策提供依据；
   （3）作为环境应力筛选应用时，目的是剔除铜排热缩管的早期故障。
    因此在编写研制过程不同阶段的环境试验大纲或筛选大纲，试验报告或筛选报告时，就将冷热冲击试验的试验目的具体化，不宜表达含糊或笼统。