Max Diedering
Metallographer, Management laboratory-Services
Senior-Expert for Metallography & refractometry

+49 8106 9941 14


Simon Löhe
Metallographer, group leader of Laboratory-Services Munich
Expert in failure analysis and metallography
+49 8106 9941 17


Robert Mertel
Graduate Engineer Materials Science
Expert metallic materials & failure analysis

+49 8106 9941 16


Damage due to Particle Impact

Particles can cause a variety of damages: For example, if they get into other machine elements such as plain bearings or gears. But foreign particles can also cause malfunctions or lead to technical problems during the manufacturing process. In the assessment of damage, the characterisation of the foreign particles is of decisive importance. Thus, the results of a precise analysis of shape, morphology and composition allow conclusions to be drawn about its origin.


Possible Causes of Foreign Particles

  • unclean assembly: dirt can get into the system due to carelessness or insufficient cleaning of the components.
  • Residues, such as metal chips or blasting material still adhering from production or overhaul, can be deposited.
  • Damage to seals: if a seal is overloaded or damaged during installation, it no longer fulfils its function and particles can penetrate
  • Lack of maintenance: excessive inspection intervals, clogged oil filters or spalling.
  • Fatigue: particles are broken out of a component and carried on. The break-outs in turn cause damage to other components.

Our experts recognise the typical damage patterns that can result from foreign particles. In addition, GWP specialises in the recovery and analysis of particles with its ParticleCheck laboratory.

Typical examinations:

  • Damage to tunnel boring machine: clarification of whether the damage can be traced back to a collision with metal parts in the ground.
  • Sliding bearing wear: clarification of the origin of foreign particles in the sliding layer.

Society for Materials Testing
Ensuring quality | Accompanying development | Analyzing damage | Passing on knowledge

GWP Gesellschaft für Werkstoffprüfung mbH
Georg-Wimmer-Ring 25
85604 Zorneding/München

Tel. +49 8106 994110
Fax +49 8106 994111

Handelsregister München
HRB 53245
USt.-IdNr. DE131179893

General Manager
Dr. Julius Nickl