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Qualification tests
in residual dirt analysis

The decline curve is a central component of residual dirt analysis and ensures that the technical cleanliness requirements are met. Repeated sampling is used to check whether the extraction parameters ensure optimal particle removal - with the aim of removing at least 90% of the particles. If the requirements are not met, the parameters are adjusted. In addition, our purity tests ensure technical cleanliness in order to reliably identify and analyze the smallest particles. These tests guarantee the quality and reliability of the components, particularly in the automotive industry, medical technology and aviation.

Decline measurement in cleanliness testing

The decline curve is a key method for qualifying extraction methods in residual dirt analysis. A component is sampled several times to check whether the specified extraction conditions and parameters ensure optimal removal of the particle load. The decline criterion requires that at least 90% of the cleanable particles are successfully removed.

If this goal is not achieved, the parameters must be adjusted or an alternative method selected. The measurement is repeated with the new settings to confirm the effectiveness of the changes. The decline curve determines the characteristic parameters of the extraction methods used and defines the blank value of the respective component. The suitability of the selected extraction procedure must be confirmed at least once for each component by qualification test in order to ensure reliable residual dirt analysis and compliance with high standards of technical cleanliness.

Decline curve

Evaluation table

The blank value (also called zero sample) is used to approve the equipment used and is carried out before each test without the component. For example, the funnel used is cleaned until the specified blank value is reached. This value can vary depending on requirements and should be a maximum of 10% of the permissible residual dirt. Careful determination and checking of the blank values is an essential step to ensure technical cleanliness and increases the significance of the qualification test.

There are two types of blank values:

  • Blank value for basic cleaning of the test equipment: This value is achieved through a specified cleaning procedure and ensures that all the test equipment is clean.
  • Component-specific blank value: This is the blank value that is achieved when testing a specific component with a defined test procedure.

Purity tests for technical cleanliness

In the area of residual dirt analysis, ensuring technical cleanliness is crucial, especially in the automotive industry, medical technology and aviation. Even the smallest particle contamination can lead to significant damage. It is therefore important that components and assemblies are comprehensively tested in order to meet the high requirements of technical cleanliness without compromise and to ensure the quality and reliability of the components. Our experienced team relies on the most modern purity tests to detect and evaluate even the smallest particles.

Causes of particle contamination

Contaminants can get onto components during the production process - not only through production itself, but also through the working environment and contact with employees. Our purity test aims to specifically identify these particles and analyze them comprehensively. This is not just about finding contamination, but also about a detailed evaluation of the particles. Our team guarantees an extremely precise and reliable way of working that fully meets your requirements for technical cleanliness.

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