Heat shrink tubing has a unique function, it can shrink when exposed to heat, but what is the general shrinkage rate of heat shrink tubing? Non-professionals may be confused at first. First, let’s understand what shrinkage rate is. The shrinkage rate of heat shrinkable tube can actually also be called the shrinkage ratio:

    Shrinkage rate of heat shrinkable tube = inner diameter before shrinkage/inner diameter after shrinkage.

    After we understand what the shrinkage rate is, we will introduce to you the general shrinkage rate of the heat shrinkable tube later, which will be very easy to understand. Commonly used heat shrinkable tubes include PE insulated heat shrinkable tubes, double wall heat shrinkable tubes, medium thick wall heat shrinkable tubes and high temperature resistant heat shrinkable tubes. They are generally divided into these five categories, and the shrinkage rate of each model is also different. , let’s analyze the shrinkage rate of various heat shrinkable tubes.

1. PE insulating heat shrink tube is currently one of the most widely used heat shrink tubes. It is made of environmentally friendly halogen-free polyethylene material. Generally, insulating heat shrink tubes are simply referred to as heat shrink tubes because there are many heat shrink tubes of different materials. They all evolved from it, so it is also the originator of heat shrinkable tubes. The general shrinkage ratio of PE insulated heat shrinkable tubes is 2:1.

2. Double-wall heat shrinkable tubes can be understood as having a double-layer structure. The outer layer is a PE polyethylene protective layer, and the inner wall has a layer of waterproof hot melt adhesive. The shrinkage rate of double-walled heat shrinkable tubes is generally 2:1, 3:1, or 4. :1, the most commonly used is 3:1.

3. Medium-thick wall heat shrink tubing is based on double-wall heat shrink tubing with thicker walls. The material is the same as double-wall heat shrink tubing. They are both PE polyethylene + hot melt adhesive. Medium-thick wall heat shrink tubing The shrinkage rate is 3:1, and the shrinkage rate of thick-walled heat shrinkable tubes can reach up to 6:1.

4. The shrinkage ratio of heat shrinkable tubes made of three materials including high temperature resistant heat shrinkable tubes (PVDF heat shrinkable tubes, oil resistant heat shrinkable tubes, fluororubber heat shrinkable tubes) is 2:1.

5. Due to the particularity of its material, Teflon heat shrinkable tube has excellent high temperature, acid and alkali resistance, and its shrinkage ratio can be 1.7:1 or 4:1.

    Later, you can also choose heat-shrinkable tubes based on the shrinkage rate. The above are some of the more commonly used heat-shrinkable tubes. The shrinkage rate of heat-shrinkable tubes is also very easy to understand. It is the inner diameter before shrinkage divided by the inner diameter after shrinkage. The value is the shrinkage ratio. The most commonly used heat shrinkable tube has a shrinkage ratio of 2 times, and the highest shrinkage ratio is 6 times. You can choose a heat shrinkable tube with an appropriate shrinkage ratio according to your product needs. If you don’t know much about it, you can directly Consult the salesperson of DUWAI heat shrink tube manufacturer.