There are two kinds of middle-wall heat-shrinkable pipes, one is with glue (double-wall pipe) and the other is without glue. They can be divided into semi-hard and conventional middle-wall heat-shrinkable pipes according to their hardness. Medium-wall pipes with adhesive are made of high-quality polyolefin materials and environmentally friendly hot melt adhesive layer. Medium-wall pipes without adhesive are elaborately processed with high-quality polyolefin materials. They are widely used for insulation protection of low-voltage electric power and mechanical strain buffer and anti-corrosion protection. The products have the characteristics of insulation, sealing and waterproof (middle-wall of adhesive), softness, self-extinguishing of outer layer and environmental protection.

Functional configuration of middle wall heat shrinkable tube:

1. Functional uses: wear-resisting, leak-proof, multi-strand wire harness sealing and waterproof, anti-corrosion protection, anti-ultraviolet.

2. Application fields of midwall pipes: heat shrinkable pipes in electronic equipment, household appliances harness, automobile harness, wire and cable, metal pipeline, water pump and submersible pump wiring waterproofing, etc.

Medium-wall heat-shrinkable pipes are mainly used in:

The sealing and insulation protection of low-voltage power wires, cable joints and terminals, extrusion resistance and corrosion resistance of wires, cables and various mechanical products, sealing protection of marine cables, pipeline corrosion protection and environmental friendly hot melt glue for sealing tape tape middle-wall pipes. The product has reliable insulation and is suitable for other protection places requiring sealing in the environment requiring RoHs instructions.

The prominent features of the mid-wall heat-shrinkable tube are as follows:

Compared with ordinary heat-shrinkable tubes, the outstanding feature of middle-wall heat-shrinkable tubes is superior mechanical performance. Because the wall thickness is thicker on the basis of conventional heat-shrinkable tubes, its wear resistance and protection ability are better, so the middle-wall heat-shrinkable tubes are more suitable for outdoor cable protection.

Corrosion in various internal and external environments often results in various accidents and major disasters. Due to the corrosion of steel pipelines and double-wall heat-shrinkable pipes, the product quality of the production enterprises is reduced. Influencing the supply of daily life, gas, heating steam or hot water, brings many difficulties to people's lives. The leakage of buried pipelines and pipelines for oil and gas transmission and water transportation, the running, leaking and dripping of pipelines and equipment for refining, chemical industry, chemical fibre, fertilizer and pharmaceuticals in enterprises, besides the loss of a large number of useful materials, causes serious environmental pollution, and even causes disastrous accidents such as fire, explosion and collapse.

From this we can see the importance of anti-corrosion measures for the production of major industries and the safety of environmental equipment, and the standards of anti-corrosion measures are higher and higher, in order to maximize the safety of industry work and social and personal safety.

Here is a brief introduction to the inspection procedure of anticorrosion with heat-shrinkable tubes.

Quality inspection of anticorrosive heat shrinkable sleeve: check the appearance of the filling one by one. The surface of the anticorrosive heat shrinkable tube should be smooth and smooth, without wrinkles and bubbles. The foot of the slope at both ends should be closely adhered to the heat shrinkable sleeve, without voids and carbonization on the surface.

Hot melt adhesives should overflow in the circumference of heat shrinkable casing. Spark leak detector is used to check the pinholes one by one at the filling point, and the leak detection voltage is 15KV. If pinholes appear, they should be repaired.

The bonding stress of the anticorrosive heat shrinkable sleeve meets the requirements, and the peeling strength is not less than 50N/CM when the temperature of the tube body is about 25 C. (Appendix) Quality inspection of anticorrosive coatings (primers). The quality of anticorrosive coatings (primers) is mainly leak point test. The coatings are completely cured and cooled to ambient temperature. Each patch is tested with a spark detector. The detection voltage is 2 KV for ordinary level and 2.5 KV for reinforcement level. When the testing head contacts the coating, it moves at a speed of about 0.2 m/s.

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中壁热缩管分类特点及防腐安装检验

中壁热缩管有带胶中壁管（中壁双壁管）和不带胶中壁管两种，从硬度上细分，有可以分为半硬中壁热缩管与常规中壁管。带胶中壁管采用优质聚烯烃材料和环保热熔胶层复合而成，不带胶中壁管采用优质聚烯烃材料精心加工而成，广泛适用于低压电力的绝缘保护和机械应变缓冲与防腐损保护，产品具有绝缘、密封防水(带胶中壁)、柔软、外层自熄、环保等特点。

中壁热缩管功能配置：

1、功能用途：耐磨、防漏气、多股线束的密封防水、防腐保护、抗紫外。

2、中壁管应用领域：电子设备、家电线束、汽车线束、电线电缆、金属管线、水泵和潜水泵的接线防水等行业热缩管。

中壁热缩管主要应用：

低压电力电线、电缆的接头和终端的密封绝缘防护、电线、电缆和各种机械产品的抗挤压和防腐损、船用线缆的密封防护、管道防腐和密封带胶中壁管用环保热熔胶，产品的绝缘性密封性可靠，适用于有RoHs指令要求的环境其它需要密封的防护场所

中壁热缩管的突出特点：

相对于普通热缩管，中壁热缩管的突出特点最明显的就是机械性能优越，因为壁厚在常规的热缩管基础上加厚，其耐磨，防护能力更加优越，因而中壁热缩管更加适合户外线缆的防护。

各种内外在环境产生的腐蚀经常造成各种事故和重大灾害。由于钢质管道、设双壁热缩管备的腐蚀，引起生产企业停工停产产品质量下降。影响生活供、供气、供采暖蒸汽或热水，给人民生活带来很多困难。埋地输油气、水等管道、管网的泄漏，企业炼油，化工、化纤、化肥、制药等管道、设备的跑、冒、滴漏．除损失大量有用的物质外又造成严重的环境污染，甚至引起火灾、爆炸、塌毁等灾难性事故。

由此可知防腐措施对于各大行业的生产以及环境设备的安全的重要性，防腐措施的标准也一高再高，为的就是尽最大限度保证行业工作的安全以及社会人身的安全，

下面就给大家简要介绍一下用热缩管进行防腐的检验步骤：

防腐热缩套管的质量检验：补口外观逐个检查，防高温热缩管腐热缩管表面应光滑平整，无皱褶，无气泡，两端坡脚处与热缩套贴合紧密，无空隙，表面没有碳化现象。

热缩套管周向应有热熔胶粘剂溢出。补口处应用火花检漏仪逐个进行针孔检查，检漏电压15KV。如出现针孔，应重新补口。

防腐热缩套管的粘接应力符合要求，在管体温度25℃左右时的剥离强度不小于50N/CM。（附）防腐涂料（底漆）质量检验防腐涂料（底漆）的质量主要是漏点验测，在涂层完全固化且冷却至环境温度下。对每个补口进行检测，用火花检测仪器，检测电压：普通级2KV，加强级2.5KV，测试头在接触涂层时，以大约0.2m/s的速度移动。