The packaging concept of samples for cleanliness testing according to VDA 19.1:2015 / ISO 16232:2018 could be described as “onion layers”. Ideally, the parts to be tested,  should be packed in at least three layers:

  • Outer layer (transport packaging):

This is usually a cardboard box, although other materials may be suitable. If placed in the outer layer, sample identification documents should be placed in such a way that other carrier labels or barcodes do not cover them. To prevent this, it is recommended to place identification documents inside the transport packaging.

In addition, it is also recommended to condition the transport packaging with elements (e.g. bubble plastic) to prevent samples from moving and knocking against each other, which can cause detachment of particles during transport and distort inspection results.

  • Intermediate layer:

This layer protects the inner layer (which is the layer of packaging in contact with the sample to be tested) and it is removed at the incoming materials SAS of the laboratory. Please use, for example, a polypropylene bag (clean, not reused and closed) or similar. Avoid the use of paper, cardboard, self-cutting closures or polymeric foams.

  • Inner layer (packaging in contact with the sample):

This layer is removed inside the laboratory clean room. When selecting the packaging in contact with the item to be tested, please ensure that the packaging does not release particles, it is clean, closed and not reused. Please check that the component is sufficiently protected against external contamination aswell. Suitable materials are, for example, hermetically sealed polypropylene bags, ESD bags….