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How to shrink special tube PTFE26012NC and PTFE26014NC, made of PTFE (Instruction)

1. First of all, always assure good ventilation in the immediate work area prior to beginning the heat shrinking process.

Caution: Fumes may cause nausea and dizziness.

2. The mandrel to be covered by the heat shrink must be able to withstand the required temperature for material recovery (see table at right).

3. The mandrel being covered may act as a heat sink (especially metal mandrels). Therefore, we recommends preheating mandrels.

4. Heat shrink should be allowed to recover a minimum of 20%. Highly restricted radial recovery tends to induce longitudinal change and increase the tendency for splitting.

5. Ovens are the most reliable way to recover heat shrink products due to their ability to ensure even heating and reduce the risk of over heating the material which can lead to brittleness and cracking. If a heat gun will be used please refer to the picture above illustrating the proper application of heat to achieve the most uniform recovery.

6. See Chart for polytetrafluorethylene (PTFE) recovery temperatures

MaterialRecovery temperature
PTFE (PTFE26012NC - PTFE26014NC) 654°F - 670°F 346°C - 354°C

The heat shrink temperatures listed in this catalog are general guidelines. Actual shrink temperatures may be higher or lower depending on the design and dimensions of the heat shrink, application techniques and other factors. For good results please be sure that you applying proper heating. If the temperature on the surface of tube will be less than shown in the chart, it may cause of irregular shrinkage or even jamming of the tube.

Also need to note, that temperature obtaining on the edge of heat gun should be little more, than needed, to compensate possible heat loss in the air gap between heat gun and PTFE shrinkable tube.