The middle wall heat shrinkable tube and the double-walled heat shrinkable tube are generally similar, with the following four points different:

1, the diameter of the tube is different: the diameter of the middle wall heat shrinkable tubing is larger than that of the double-walled heat shrinkable tube, the softness is relatively small.

2, the glue coating method is not the same, double-wall tube is extrusion at the same time, the middle wall tube coating method is divided into direct coating and spiral glue;

3, the degree of high temperature resistance is not the same, the medium wall heat shrinkable tubing Continuous use temperature: -55℃~105℃, the lowest starting shrinkage temperature: 80 ℃, the lowest total shrinkage temperature: 120 ℃, the basic and double-walled tube consistent, but the maximum use of temperature double-walled tube can reach 125 ℃, And the hot shrinkage middle wall tube in the maximum of 105 ℃ heat shrinkable pipe continuous work, in fact, in the highest temperature continuous operation, the service life of the material will be greatly shortened, they are also relatively good low-temperature brittleness, can be in:-55 ℃ above the temperature continuous operation without brittle cracking.

4, the degree of high pressure resistance is not the same: the middle wall heat shrinkable tubing due to thicker, voltage resistance is also strong, widely used in 10KV cable insulation tube Seal (1mm breakdown strength ≥25kv). The general pressure resistance level of a double-walled heat shrinkable tube is 0.6KV.

The heat flux of a double-walled heat shrinkable tube has the following effects:

1, corrosion resistance: resistant to seawater, grease, acid, alkali and other chemical corrosion, antibacterial, non-toxic, tasteless, pollution-free;

2, soundproofing: Closed double-walled heat shrinkable tube bubble hole, good sound insulation effect;

3, Insulation: Heat insulation, insulation and cold and low temperature performance excellent, can withstand cold and exposure;

4, processability: No joints, and easy to carry out hot pressing, tailoring, glue, bonding and other processing.

5, water resistance: closed bubble hole structure, no water absorption, moisture-proof, good water resistance;

6, anti-vibration: back elasticity and high tensile tension, high toughness, with good shockproof/cushioning performance.

The full name of the middle wall heat shrinkable tube is the heat shrinkage medium wall thickness tube, also known as the hot shrinkage medium wall tubing, the medium thick wall heat shrinkable tube, the middle wall tube, abbreviated as the middle wall tube. Typically, the middle wall heat shrinkable tubing has only one color, black. The material of the medium wall heat shrinkable tube is irradiated polyethylene material, because of the large caliber of the medium wall heat shrinkable tube and the relatively small flexibility, which is one of the more reasons for the use of the medium wall heat shrinkable pipe on warships and ships. The medium wall heat shrinkable tube is widely used in the insulation tube seal of 10KV Cable (1mm breakdown strength ≥25kv) because of its thick and strong voltage resistance.

A special technical parameter of the middle wall heat shrinkable tube is the stripping strength, the industry internal value is usually the stripping strength PEELINGTRENGTH≥125N/25 (according to the DIN30672 test), to meet this requirement, the middle wall tube can give full play to the role of protection, sealing, This is closely related to the performance of the hot melt adhesive in the inner wall tube layer.

分析中壁管和双壁管特点

中壁热缩套管和双壁热缩管总得来讲是差不多，有以下四点不同：

1、管的口径大小不同：中壁热缩套管的口径比双壁热缩管大，柔软性相对小些。

2、内层胶的涂胶方式不一样，双壁管是同时挤出，中壁管涂胶方式分为直涂和螺旋涂胶；

3、耐高温程度不一样，中壁热缩套管连续使用温度：-55℃～105℃，最低起始收缩温度：80℃，最低完全收缩温度：120℃，基本和双壁管一致，只是最高使用温度双壁管能达到125℃，而热缩中壁护套管最多在105℃热缩管上连续工作，实际上在最高温度上连续工作，材料的使用寿命也会大大缩短，他们低温脆性也比较好，能在：-55℃以上温度连续工作而不脆裂。

4、耐高压程度不一样：中壁热缩套管由于较厚，耐电压性能也强，广泛应用在10KV电缆的绝缘护套密封上（1mm击穿强度≥25KV）。双壁热缩管一般的耐压级别是0.6KV.

双壁热缩管的热熔剂有以下作用：

１、耐腐蚀性：耐海水、油脂、酸、碱等化学品腐蚀，抗菌、无毒、无味、无污染；

２、隔音性：密闭双壁热缩管泡孔，隔音效果好；

３、保温性：隔热，保温防寒及低温性能优异，可耐严寒和曝晒；

４、加工性：无接头，且易于进行热压、剪裁、涂胶、贴合等加工。

５、耐水性：密闭泡孔结构、不吸水、防潮、耐水性能良好；

６、防震动：回弹性和抗张力高，韧性高，具有良好的防震/缓冲性能。

中壁热缩管全名是热缩型中等壁厚护套管，又叫热缩中壁管，中厚壁热缩管，中壁护套管，简称中壁管。通常情况下中壁热缩管只有一种颜色，黑色。中壁热缩管的材质是辐照聚乙烯材料，由于中壁热缩管的口径大，柔性也相对小些，这是中壁热缩管在军舰、船舶上用的较多原因之一。中壁热缩管由于较厚，耐电压性能也强，广泛应用在10KV电缆的绝缘护套密封上（1mm击穿强度≥25KV）。

中壁热缩管有一项特别的技术参数是剥离强度，行业内设计值通常是剥离强度Peelingtrength≥125N/25（按DIN30672测试），满足这个要求，中壁管才能充分发挥保护、密封的作用，这就与中壁管内层的热熔胶的性能息息相关。