• Fingerprints (hand cream/sweat residues).
  • Materials in contact with the sample that may generate particles, such as paper, cardboard, polymer foam…
  • Contact between the parts themselves, with the consequent risk of particle generation.
  • Identification with permanent markers/adhesive labels directly on the component to be tested.
  • Failure to secure the contents/close the sample bags.
  • Packaging of hot samples, with the risk of condensation.