RJL Micro & Analytic GmbH
Methods of component cleanliness testing

«Systematic cleanliness analysis»

Significant test results demand a profound understanding of the methods and directives.
We support you with qualified advice, service and a variety of appropriate products.

Methods of cleanliness testing










1. Extraction of surface contamination


2. Gravimetric analysis of residual oil mass



extraction by pressure rinsing

At first, the contaminants are
extracted and transferred into
a liquid medium by means of
rinsing, pressure spraying,
ultra sonic rinsing or wiping.
Thereafter, the particles are
prepared onto a membrane
by vacuum filtration.

related products  Particle Extraction


extraction of residual oil by means of evaporation

After rinsing, residual oils and
grease are separated from the
liquid medium (e.g. petroleum
ether) by selective evaporation
and weighed individually. The
residual oil mass is a measure
for the quality of grease-free
surfaces of components.










3. Gravimetric analysis of particle mass


4. Particle counting and sizing



laboratory balance for gravimetric analysis

The simplest approach to assess
the particle quantity is weighing
the filter before and after loading
the particles onto the membrane.
The difference of these values
is the particle mass. For basic
cleanliness testing, this result
is often sufficient.


loaded membrane in the particle scanner

Optical high-end scanners allow
counting and sizing of particles
on a filter within a few minutes.
Since particle scanners work so
rapidly and economically, the
technique is predestined for
daily process control.

related products  MicroQuick particle scanner










5. Particle measurement in 3D


6. Granulometric analysis with material typing



particle in 3D visualisation

In cleanliness testing, the trend
goes towards spatial sizing of
contaminant particles. In order
to measure the individual size
and volume of particles, X-ray
microtomography systems are

more information  particle sizing in 3D


EDX typing of quartz sand

The ultimate solution in particle
analysis is sizing and chemical
typing by means of automated
electron microscopy and EDS.
Amongst number and size, the
chemical composition for each
particle is determined.

more information  SEM-EDS particle analysis









Our products for cleanliness testing





  • Equipment for particle extraction particle extraction
  • Precision laboratory balances and evaporators
  • MicroQuick optical particle scanner MicroQuick particle scanner
  • SEM-EDX particle analysers Aspex SEM-EDX
  • Micro-CT systems for 3D particle sizing SkyScan Micro-CT


Analytical services with ISO accreditation






Easy to handle, fast turn-around


  • Our laboratory is proficient in all techniques required
    for cleanliness analysis. analysis service
  • Review an extract of the test directives that our
    service laboratory is able to comply. VDA-19, ISO-16232 and Co.


© RJL Micro & Analytic GmbH, Im Entenfang 11, 76689 Karlsdorf-Neuthard, Germany (2007-18) - Imprint - Sitemap


Accredited Contract Laboratory Aspex Bruker microCT Component Cleanliness Contamination Analysis E2V EDX Gunshot Residue GSR in-vivo ISO-16232 ISO-17025 ISO-4405 ISO-4406 ISO-4407 Kubtec Laser Microscopy Material Analysis Micro-CT MicroQuick Microtomography Millbrook MiniSIMS Nano-CT Nanotomography Nanophoton Oil Cleanliness Analysis Particle Analysis Particle Scanner Particle Typing PSEM Radiography Raman Microscopy Residual Dirt Analysis X-Ray Inspection Analysis SAI Scanning Electron Microscopy SEM-EDX SGX Sensortech SIMS-TOF SkyScan South Bay Technology Steel Inclusion Analysis Technical Cleanliness Time-Of-Flight VDA-19 Non-Destructive Testing