1. The heat-shrinkable tubing is not tightly attached to the object

If temperature is applied to the heat-shrinkable tubing from the outside, the heat-shrinkable tubing isolates the temperature from the object. In this case, the object is too cold and cools the heat-shrinkable tubing from the inside. Consequently, it does not fit tightly onto the object.

The heating should be continued for a longer period of time in order to heat up the processed object accordingly.

2. The processed object is “wavy”after shrinking

Any visible waves that appear on the shrunken object are usually air inclusions. The best way to avoid this is to reduce the temperature and at the same time increase the exposure time. If this does not prove effective, the shrinking process should be initiated from the centre of the processed object. Start from the centre and proceed to both sides. This will force excess air out to the ends.

In the event that waves persist, it is possible that the contracted object is “outgassing”. In this case, please contact us to solve the problem jointly.

3. The heat-shrinkable tubing ruptures during the shrinking process

The polymer is soft and fragile throughout the shrinking process. The heat-shrinkable tubing may crack if the objects are very sharp-edged. The same applies to selective overheating in the course of the shrinking process. If the product is subject to repeated damage, try using the next larger size. In many cases, the problem will resolve itself.