Cleanliness detection - decline test

In the cleanliness test, the product needs to undergo attenuation testing for the first time in order to obtain effective testing methods and parameters. Make the detection more convincing.

For similar products, attenuation test parameters can be shared.It is also recommended to further verify through secondary testing.

Definition of Decrement Testing:

Using the same method to extract contamination from the same component multiple times

Particles until 90% of the pollutants are extracted. If six extraction attempts have been made but the value ≤ 10% has not been reached, the extraction parameters must be modified.

Progressive testing process:

Blank confirmation

Quantity confirmation

The startup parameters should be appropriate

Interruption is not allowed during the testing process

The conditions of each cleaning program are the same

6 times in total

Note: If the 10% standard is reached after n separate cleaning steps, the detection program (at least) should be (n-1) times the cleaning time or cleaning volume.