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40 Research on hygienic flooring systemsalso recorded. 28 Figure 15 shows a graphical illustration ofthe test results and corresponding SPC class of a materialsurface before and after cleaning. Figure 16 shows the nalresults from different material surfaces tested.Figure 15. Graph showing the test results and corresponding SPCclass of a material surface before and after cleaning. Particle sizesare shown on the x-axis. Particle concentrations are shown on they-axis. SPC class values have been taken from ISO/FDIS 14644-9.Figure 16. Overview of examples of material surfaces tested andrelative cleaning efciency.SummaryA comprehensive understanding of the various aspects ofcleanliness in hygienic manufacturing is required in order toselect suitable ooring systems for cleanroom constructions.Reliable procedures for testing and assessing the cleanlinesssuitability of materials make it possible to compare materialsobjectively. The procedure has been standardised in theguideline VDI 2083 Part 17. The ISO standardisationcurrently being carried out at international level is based onthe VDI guideline. By carrying out numerous tests on ooringsystems, a pool of knowledge has been created regardingthe cleanliness suitability of materials for use in hygienicmanufacturing environments.Under www.tested-device.com and www.ipa-csm.com, theworlds rst public database has been set up by FraunhoferIPA for materials and operating utilities suitable for use incleanrooms and hygienic manufacturing environments.The materials and results accessible to the public canbe viewed at any time. This enables appropriate ooringsystems to be selected for use in clean and hygienicmanufacturing environments even during the design phaseof a manufacturing environment.