1. Determine the shrinkage ratio of the heat shrinkable tube

    As an important performance parameter of heat shrinkable tubes, the shrinkage ratio is an important indicator that cannot be ignored when selecting heat shrinkable tubes. The shrinkage ratio refers to the multiple of the inner diameter reduced after heat shrinkage. Currently, the commonly used shrinkage ratios of heat shrinkable tubes are 2 times and 3 times. 4x and up to 6x shrinkage. Usually for the same specifications, the greater the shrinkage ratio, the higher the price. 2 times, 3 times, and 4 times can be used to make single-wall heat shrinkable tubes, or double-walled heat shrinkable tubes with glue. However, 6 times heat shrinkable tubes can only produce medium-sized glued ones with thicker walls due to the higher shrinkage. Thick wall heat shrink tubing.

2. Determine the working temperature

    The working temperature of heat shrinkable tubes varies depending on the model and material. The maximum temperature range ranges from 105°C to 260°C. Some special occasions also require a minimum operating temperature, which ranges from minus 65°C to minus 45°C. Therefore, it is necessary to have a general understanding of the working temperature of heat shrink tubing. According to the highest temperature resistance level, it can be divided into seven levels: 105°C, 125°C, 135°C, 150°C, 175°C, 200°C and up to 260°C. You can choose the heat shrinkable tube with the corresponding temperature according to your own product requirements.

3. Determine usage occasions and purposes

    Heat shrinkable tubes can be divided into food and medical grade heat shrinkable tubes (silicone heat shrinkable tubes and PVDF heat shrinkable tubes), sealed waterproof heat shrinkable tubes (glued heat shrinkable tubes), acid and alkali solution heat shrinkable tubes (Teflon) according to their uses. Heat shrink tubing), oil-resistant heat shrink tubing (fluorine rubber heat shrink tubing), military-grade heat shrink tubing and high-voltage insulating heat shrink tubing (busbar heat shrink tubing). You can choose the corresponding heat shrink tube according to the application environment and technical requirements of the product.

4. Determination of specification inner diameter

    The selection of the inner diameter of the specifications is relatively simple. You only need to measure the maximum and minimum dimensions of the product that needs to be covered. If the joint between the connector and the cable needs to be protected, you only need to use a caliper to measure the wire diameter and the outer diameter of the connector, and then select the heat shrink tube with the corresponding hole diameter according to the outer diameter of the connector. Never follow the Select the heat shrinkable tube specification for the wire diameter, so that the connector cannot be inserted into it. When selecting the heat shrinkable tube specification, the inner diameter must be selected according to the large end of the heat shrinkable tube.

5. Color selection

    The colors of heat shrinkable tubes are relatively complete. Black is the color of all heat shrinkable tubes. PE polyethylene heat shrinkable tubes are available in black, white, transparent, gray, brown, red, orange, yellow, green, blue, purple, etc. 11 There are three standard colors. It should be noted that the transparent heat shrinkable tube made of PE is not flame retardant. Ground wire heat shrinkable tubes can be made in yellow and green colors. Heat shrinkable tube manufacturers can also customize heat shrinkable tubes with two-color stripes.

    The specifications of heat shrinkable tubes only need to be selected from the five perspectives of shrinkage ratio, working temperature, usage environment, specification inner diameter and color. Through these five basic indicators, it is easy to select the appropriate high-quality heat shrinkable tubes. If you are not sure which model and specification of heat shrink tube to use, you can contact the heat shrink tube manufacturer Duwai’s online customer service, and the heat shrink tube manufacturer will help you choose the appropriate heat shrink tube, with one-stop service from selection to delivery.