Common polyolefin materials include polyethylene (PE), vinyl acetate copolymer (EVA), polyvinyl chloride, polytetrafluoroethylene, polyvinylidene chloride, etc. Their response temperatures vary greatly depending on the type. Ranging from 80 degree to 180 degree ; Therefore, various types of heat shrink tubing have different uses. Fluorinated materials have a higher temperature response and are more commonly used in situations that require high temperature and corrosion resistance; EVA has a lower response temperature, making it suitable for use as a heat shrink tubing for low-temperature shrinkage, applied in fields such as home appliances or electronic component protection. The long-term usage temperature of this product is between -40 degree and 125 degree .

As the name suggests, heat shrink tubing has a special function of encountering heat shrinkage. Before selecting a suitable heat shrink tubing, we often need to first understand the characteristics and related parameters of the product. This is crucial for selecting the appropriate heat shrink tubing and using it correctly. There are various types of heat shrink tubing on the market, how to choose the appropriate heat shrink tubing? It is recommended to pay attention to the following 6 parameters before purchasing heat shrink tubing.

1 Inner diameter

The inner diameter of a heat shrink tube refers to the size of the inner diameter of the tube wall, which is the distance between the inner walls. It is usually used Φ This letter is used to represent. because Φ In engineering, it is used to indicate the diameter, followed by a number to indicate the value of the inner diameter, with a default unit of mm. For example: Φ 3 refers to an inner diameter of 3 millimeters.

2 Wall thickness

3 Shrinkage rate

For example, the inner diameter before contraction is Φ 6. The inner diameter after contraction is Φ 3. The shrinkage rate is Φ 6/ Φ 3=2/1. The common shrinkage rates of heat shrink tubing are 2:1, 3:1, and 4:1; After the shrinkage of heat shrink tubing, the wall thickness will increase. For heat shrink tubing, the more important wall thickness refers to the wall thickness after the shrinkage of the heat shrink tubing, because the shrinkage is the true working state of the heat shrink tubing.

4. Shrinkage temperature

The starting shrinkage temperature refers to the temperature at which we start heating the heat shrink tubing until it begins to shrink. The starting shrinkage temperature for our typical PE heat shrink tubing is 84 degree .

5 Final shrinkage temperature

Knowing the starting shrinkage temperature makes the final shrinkage temperature obvious. The final shrinkage temperature refers to the temperature after complete shrinkage, which can cause the heat shrink tubing to reach a state of complete shrinkage. For example, when PE heat shrink tubing is heated to 84 degree , it will begin to shrink, but to continue shrinking, continuous heating is necessary. Shrinkage of heat shrink tubing is a gradual process. If it can only fully shrink when heated to 100 degree , then 100 degree is its final shrinkage temperature.

6 Working temperature