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Is gas tightness possible with ferrules?

For a gas-tight connection, the conductor and connector must be pressed together so tightly that there are absolutely no more gaps.
With wire ferrules, such a firm connection is generally not possible. The reason for this is as follows: Wire ferrules are made of very thin-walled (0.15 mm) copper, which is why "gas tightness" is only possible if the wire ferrule and cable are pressed together by the closed crimping pliers.

As soon as the crimping tool is opened again after crimping, the thin-walled ferrule gives way to the springback of the crimped cable and gaps are created in the crimp connection. A permanent, gas-tight connection is only possible with connectors with thicker walls.

However, a crimp connection is generally considered to be OK if the following main criteria are met:

  • - If the withdrawal values of the crimped ferrule from the conductor correspond to the values specified in DIN EN 60352-2
  • - If the volume resistance for the respective cross-section (determined according to IEC 60512-2, test 2) does not exceed the limit values specified according to DIN 60352-2 before and after the stress. For this purpose, test specimens are stored in a wired state in an industrial atmosphere in accordance with DIN 50018, climate level SFW 0.2 S.

The crimp connections made with our wire ferrule pliers meet these requirements.