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The clean test consists of several phases. After the components have been decontaminated, the samples are taken from the line and taken to our laboratory where they are analysed.

First, it is necessary to extract the residual contaminant deposited on the components. The pieces to be analysed are then taken and, taking care to preserve their cleanliness, introduced into a special cabinet. The latter is equipped with a filtration and pressurisation system, which allows for a controlled contamination environment to be replicated (as in a clean room), and an integrated extraction liquid filtration system. This type of instrumentation allows all the residual particulate matter to be extracted in an aseptic and perfectly clean environment, thus preventing contaminants from outside from depositing on the samples, falsifying the test results.
After the contaminant has been collected and deposited on special filtering membranes, it is necessary to measure the degree of contamination. This result is achieved both by calculating the mass of the particles (gravimetry) and by identifying and cataloguing the particles found (granulometry). An essential element for this process is the particulate analysis and counting system used. In our laboratory we use a motorised optical microscope, which allows us to detect and identify the contaminant extracted from the samples automatically through an image analysis software.

Thanks to this system it is possible to obtain an accurate count and characterisation of the particles based on their size and appearance. In this way we are able to establish the most suitable cycle for cleaning a component and to determine its cleanliness precisely.


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