How to accurately detect the inner diameter of the heat shrinkable tube, commonly used is plug gauge (or Core rod), the plug gauge into the tube, visual inspection for four weeks without clearance, the core rod should be easy to put in and pull out of the tube. The outer diameter value of the plug gauge is the inner diameter value of the casing. The inner diameter value of the heat shrinkable tube usually retains only one bit after the decimal point (unit mm), but also useful to the projector equipment detection, for the larger specification casing inner diameter measurement of an empirical formula: inner diameter ≈ fold diameter ÷1.57 (wherein, the folding diameter is the width of the casing flattening fold).

How to accurately detect the wall thickness of the heat shrinkable tube, such as: double wall heat shrinkable casing, professional and accurate method using wall thickness gauge or projector to test, can avoid human error, heat shrinkable tube itself has a certain elasticity, generally used to use vernier caliper for measurement, but the measurement process needs to master the measurement technique, The weight of the technique will obviously affect the results of the test, the heat shrinkable tube wall thickness industry is to calculate its average wall thickness [average wall thickness = (highest point value + Lowest value)/2, while considering its wall thickness of the concentric rate of ≧70%, concentric rate = The lowest value of the heat shrinkable tube/The highest point value *100%].

After cutting the heat shrinkable tube, why the number of meters is often less. Customers cut hot shrinkage casing after the discovery of a small number of phenomena, generally according to the number of cutting segments are less than dozens of meters or more, this is normal phenomenon, for example: 5000M each segment cut 10mm, a total of 500,000 segments. In general, the size of the cut pipe is controlled in 10.1mm~10.5mm, so that the actual calculation of the required heat shrinkable casing length is: 500000 segments of *10.1=5050m or 500000 *10.5mm=5250m, plus the loss of cut pipe abnormalities, General case cut 500,000 section need to heat shrink casing 5050m~5250m around, so with 5000m tube to cut will appear juvie phenomenon (except in the case of insufficient number of packaging whole volume).

Cold Shrinkage Cable accessories commonly known as cold shrinkage cable head, it is the use of elastomer materials (commonly used silicone rubber and ethylene propylene rubber) in the factory injection vulcanization molding, and then through the expansion of the diameter, lining with plastic spiral support double-walled heat shrinkable pipe to form a variety of cable accessories components, the conventional materials are silicone rubber and ethylene propylene rubber. Thermal shrinkage Cable accessories commonly known as heat shrinkable cable heads, are widely used in 35KV and thermal shrinkage cable accessories below the voltage level of the cross-linked cable or oil-immersed cable intermediate connection and terminal. Compared with the traditional cable accessories, it has the characteristics of small size, light weight, safe and reliable, convenient installation and so on. This kind of products mainly use stress tube to deal with the problem of electrical stress concentration. That is, the parameter control method is used to relieve the stress concentration of electric field. Products in line with GB11033 standards, long-term use of temperature range of -55℃~105℃, aging life of up to 20 years, radial shrinkage ≥50%, longitudinal shrinkage <5%, shrinkage temperature of 110℃~140℃. The materials used in the thermal shrinkage cable accessories are generally made up of blends of various material components, such as polyethylene, ethylene-vinyl acetate (EVA) and ethylene propylene rubber.

Cable cleaning paper is an environment-friendly pure aluminum bag imported spinning adhesive cloth and deionized water and professional organic solvents professional secret formula refined from. This product is specialized in high-temperature heat shrinkage pipe raw materials, do not drop dandruff, no water marks, no need to dry, high efficiency decontamination, strong friction, insulation anti-conductive. Just wipe gently, you can immediately remove the wire and cable hot and cold shrinkage accessories on the grease, dirt. When cleaning cable and cable accessories, you should pay attention to the direction of cleaning, the correct method is: From the end of the wire to clean down in turn, do not wash back and forth. Cleaning back and forth is easy to leave the tiny carbon particles of the semi-conductive layer on the main insulation, reducing the insulation performance.

Silicon fat paste is a colorless translucent silicone grease paste complex made of polymer polysiloxane thickening high purity inorganic thickener, modified silicone oil, ultra-pure insulating filler and adding functional auxiliaries.) The special process.

Silicon fat paste used in high-voltage cable accessories (more than 10kv power cable connectors and switch accessories) and electrical insulators, to prevent Corona release and elimination of arcs, insulation, anti-crawl, sealing lubrication and anti-moisture and other functions; in the production of cable head, usually face and surface contact parts should be coated with silicone grease, its role is insulation, sealing, lubrication.

热缩管的内径测量及区分热缩电缆附件材料

如何准确检测热缩管的内径，普遍用的是塞规（或称芯棒），将塞规放入管内，目测四周无间隙，芯棒应容易放入及从管内抽出。塞规的外径值即为套管的内径值。热缩管的内径值通常只保留小数点后一位（单位mm），另也有用到投影仪设备检测，对于较大规格套管内径测量的一个经验公式：内径≈折径÷1.57（其中，折径是指套管压扁对折的宽度）。

如何准确检测热缩管的壁厚，如：双壁热缩套管，专业准确的方法采用壁厚规或投影仪来检验，可以避免人为的误差，热缩管本身具有一定的弹性，一般习惯于采用游标卡尺进行测量，但测量过程中需要掌握测量手法，手法的轻重会明显影响到检测的结果，热缩管壁厚行业中是计算其平均壁厚[平均壁厚=（最高点值+最低点值）/2，同时考虑其壁厚的同心率≧70%，同心率=最低点值热缩管/最高点值*100%]。

裁切热缩管后，米数为何经常偏少。客户裁切热缩套管后发现有少数的现象，一般是按裁切的段数算少了几十米或更多些，此属正常现象，其原因例如：5000M每段切10mm,共50万段。一般情况下切管尺寸都控制在10.1mm~10.5mm，这样按实际计算出所需热缩套管长度为：500000段*10.1=5050m或500000段*10.5mm=5250m,加上切管异常时损耗，一般情况切50万段需用热缩套管5050m~5250m左右，所以用5000m管来切的话就会出现少管现象（包装整卷数量不足的情形除外）。

冷缩电缆附件俗称为冷缩电缆头，它是利用弹性体材料(常用的有硅橡胶和乙丙橡胶)在工厂内注射硫化成型，再经扩径、衬以塑料螺旋支撑双壁热缩管物构成各种电缆附件的部件，常规用的材料是硅橡胶和乙丙橡胶。热缩电缆附件俗称热缩电缆头，广泛用于35KV及热缩电缆附件以下电压等级的交联电缆或油浸电缆的中间连接和终端上。与传统电缆附件相比具有体积小、重量轻、安全可靠、安装方便等特点。该类产品主要采用应力管处理电应力集中问题。亦即采用参数控制法缓解电场应力集中。产品符合GB11033标准，长期使用温度范围为-55℃～105℃，老化寿命长达20年，径向收缩率≥50%，纵向收缩率<5%，收缩温度为110℃～140℃。热缩电缆附件所用材料一般为以聚乙烯、乙烯-醋酸乙烯（EVA）及乙丙橡胶等多种材料组分的共混物组成。

电缆清洁纸是环保型纯铝袋进口纺粘布及去离子水及专业有机溶剂专业秘制配方精制而成。本品为专高温热缩管用原料，不掉毛屑，无水痕，无需擦干，高效去污，强摩擦力，绝缘防导电。只需轻轻擦拭，便可立刻去除电线电缆冷热缩附件上的油脂、污垢。在清洗电缆和电缆附件时，应注意清洗的方向，正确的方法是：从导线的端部开始向下依次清洗，不可来回清洗。来回清洗容易把半导电层的微小碳粒成分留在主绝缘上，降低绝缘性能。

硅脂膏是由高分子聚有机硅氧烷稠化高纯度无机稠化剂、改性硅油、超纯绝缘填料并添加功能助剂等，经特殊工艺制成的无色半透明有机硅油脂膏状复合物。

硅脂膏应用于高压电缆附件（10kv以上电力电缆接头及开关附件）及电气绝缘体，防止电晕释放和消除电弧，起绝缘、抗爬电、密封润滑和抗潮湿等作用；在制作电缆头时，凡是面和面接触的部位都应涂抹硅脂，它的作用是绝缘、密封、润滑。