These tests are used to verify that the design of the operating cycle, selection of the process parameters and the moisture contained in the steam are such that the level of moisture remaining in the load at the end of a sterilization process has not increased by more than 1% for textiles and 0.2% for metal.  See BS EN 285 for the test method.

ISO 17665:2024 - Annex C.8

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This test prescribed in BS EN 285, clause 20, is used to demonstrate that the operating cycle, without extended drying, will not cause an increase in moisture in a standard test pack sufficient for there to be uncertainty about the dryness of loads routinely processed.

The load dryness, metal test is performed with a reference load and is used to demonstrate that the operating cycle is unlikely to cause moisture problems in routine operational loads. If moisture problems are identified after the test has been successfully completed, the cause may be the type of load and location on the sterilizer chamber. It is therefore advisable, if possible, to process a routine operational or production load.

Process a production load that is known to present the greatest challenge to the operating cycle. Extended drying may be required.

The check should be considered satisfactory if a “cycle complete” indication is obtained, and the load is sensibly dry.

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