The standard "ISO 16232-10 Road vehicles - Cleanliness of components of fluid circuits - Part 10: Expression of results" developed by the International Organization for Standardization (ISO) describes the rules and formats for expressing and presenting the measurement results of particulate cleanliness of components of fluid circuits for motor vehicles. This standard also provides a cleanliness coding system to simplify the reporting and communication of particulate contamination data. This standard also defines the rules to be used to specify cleanliness requirements. However, this standard does not cover the particulate cleanliness of fluids.
Particulate contamination measured in the entire volume of the extraction fluid used in one of the extraction and analysis methods described in the ISO 16232 series of standards is measured as follows:
The level of particle contamination can be expressed by the total mass, particle size distribution (number of particles per size class) and possibly combined with the nature of the particles or by the size of the largest particle found. Data can also be combined, for example, as total mass and largest particle.
Cleanliness levels can only be compared if they are in the same units of measurement, i.e. per 1000 cm2 of wetted surface area or per 100 cm3 of wetted volume.
The cleanliness levels expressed per component should never be compared with each other. They should only be used to compare a result with a specification. The annex to the standard provides recommendations for the use of appropriate component cleanliness code coding (Annex A).
Considering the different physical principles used to assess particle size, for example a microscope or light-quenching automatic particle counter, the level of particle contamination measured in the same extraction sample may differ.
The expression of gravimetric analysis results requires knowledge of the following properties:
There is no correlation between gravimetric analysis results and other contamination analysis results (e.g. particle counting).
When expressing particle size distribution analysis results, the information detailed in this standard and the following are required to present data from extraction tests and derive the component cleanliness code:
Particles are counted in all or part of size ranges defined by an inclusive child dimension (x1) and an exclusive parent dimension (x2) from those listed in the table. Each size range is labeled with a letter that identifies a size class.
The level of particle contamination of a component in a particular particle size class is expressed as a function of the number of particles counted on the component according to the selected geometric unit (100 cm3 or 1000 cm2), with the number specified in the table.
In short, the ISO 16232 standard contains requirements for the implementation and documentation of methods for determining particulate contamination on functionally relevant components and systems of road vehicles (cleanliness audit). The cleanliness audit forms the basis for assessing technical cleanliness achieved under the following conditions, for example:
This standard aims to improve the informative quality and comparability of test results. It also defines the standardized expression of cleanliness specifications and cleanliness test results in the quality chain of the automotive industry.
Among the numerous tests, measurements, analyses and evaluations carried out for businesses in various sectors, our organization also provides testing services defined in the standard “ISO 16232-10 Road vehicles - Cleanliness of components of fluid circuits - Part 10: Expression of results” with its trained and expert staff and advanced technological equipment.
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