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5.1.3 Test gases

The test gases that are used for leak detection (also called tracer gases) should satisfy the following prerequisites:

They should

The test gas helium satisfies all of these requirements. As a noble gas, it is not capable of chemically reacting. Only 5 ppm of it is present in atmospheric air, thus enabling even the smallest leakage to be detected. Since it is lighter than air, it thus does not pose a health hazard.

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