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Heat-shrinkable sleeve peel strength test

Time:2020/5/12 posted:Kehong Enterprises Co.,Ltd.

After the heat shrinkable sleeve is baked to the welding port, we have to carry out some tests to check whether it is qualified and meets the standard. One of the more important items is peel strength.

The peel strength test of the heat shrinkable sleeve filler material can reflect the advantages and disadvantages of its bonding performance from two aspects. One is the peel strength value, and the other is the peeling phenomenon, which reflects the adhesion between the heat shrinkable sleeve substrate and the glue, the glue and the reduced primer or overlap area, the primer and the steel pipe, and the cohesion of each layer of material. Divided into 5 categories:

1. Fully cohesive peeling. The peeling section is an adhesive layer, and the surface of the primer layer or the surface of the substrate is evenly occupied by the surface of the adhesive layer.

2. Partial cohesive peeling / partial non-cohesive peeling. The peeling section is divided into the adhesive layer, and part of it exhibits non-cohesive peeling from the primer or substrate (there is a peel strength value, but the adhesive layer is pulled away from the primer or substrate surface)

3. Completely non-cohesive peeling. That is, the peeling section is pulled away from the surface of the adhesive layer and the primer or the substrate.

4. Partial non-cohesive peeling / partial loss of adhesion. That is, the part of the peeling section is occupied by the primer, and the part is layered with the primer or the substrate.

5. Complete loss of adhesion. That is, the peel strength is zero, and the primer or substrate and the heat shrinkable sleeve material are in a layered state.

General peel strength test method:

First, cut the anticorrosive layer along the circumferential direction with a width of 20-30mm and a length of more than 100mm. When cutting, the anticorrosive layer should be cut through and the one end should be pryed up. Use a dynamometer to pull the anticorrosion layer at a rate of 10mm / min perpendicular to the surface of the steel pipe at a uniform speed, and record the value of the dynamometer. When measuring, a surface thermometer should be used to monitor the temperature of the outer surface of the anti-corrosion layer, and the peel strength test should be completed between 45-55 degrees Celsius.

The data value recorded by the dynamometer divided by the peeling width of the anticorrosive layer is the peeling strength in N / cm. The measurement results are expressed as the average of three measurements.

Normally, we measure the peel strength of the heat shrinkable sleeve, which is generally at a normal ambient temperature, about 24 degrees Celsius. It cannot be carried out at low or high temperatures.

Kehong Enterprises Co.,Ltd.

Tel: +86-20-82586869

Mob: +8615918777767 (Wechat)

E-mail: sales1@gzhelectric.com





1,完全内聚剥离。 剥离断面为胶层,底漆表面或基材表面均匀胶层表面所占满。

2,部分内聚剥离/部分非内聚剥离。 剥离断面部分为胶层所占满,部分与底漆或基材呈现非内聚剥离(有剥离强度数值,但胶层与底漆或基材表面被拉开)

3,完全非内聚剥离。 即剥离断面从胶层与底漆或基材表面被拉开。

4,部分非内聚剥离/部分失黏。 即剥离部分断面为底漆所占满,部分与底漆或基材分层。

5,完全失黏。 即剥离强度为零,底漆或基材与热缩套材料呈分层状态。





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