QUICK TEST CLEANLINESS PARTICLE SCANNER Particle Contamination ANALYZE TECHNICAL CLEANLINESS QUALITY CERTIFIED ACCREDITED ANALYZES DAMAGE HARD PARTICLES DETERMINE HARDNESS SURFACE CONTAMINATION PARTICLE ORIGIN? EDX ELEMENTAL ANALYSIS PARTICLE CONTAMINATION? CLEANLINESS ANALYSIS

ONLINE BASIC COURSE

Cleanliness Analysis According to VDA 19.1 & ISO-16232
PART 9
Presentation of Particle Cleanliness

For each particle type, the particle size distribution is typically plotted in a histogram against the maximum number of particles allowed (see figure).

Particle size distribution plotted as a histogram in a cleanliness report

By definition, any object detected on the filter is referred to as a particle. Particles are further divided into soft fibers and solid granules. Often, the soft fibers are neglected in a cleanliness specification, since their damage potential is considered low.

The automatic distinction between fibers and granules is based on a simple shape recognition. In addition, optical instruments are capable of detecting metallic reflections of particles. It has become common to distinguish between matt and metallic glossy particles. This typification allows a more accurate assessment of damage potential.

Nevertheless, it is to be emphasized that the identification of metals by means of light-optical methods represents more of an "estimate", rather than a reliable material analysis. Especially if particles have a corroded surface, which is often the case, metallic reflections cannot be seen. On the other side, metallic pseudo reflections can be caused by glossy plastic or glass particles. If a particle's material and thus its origin is to be reliably identified, other methods such as SEM-EDX or molecular spectroscopy have proven to be flawless.

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