Suitable coating systems for pure areas

Author: Wolfgang Konle� Ever more enterprises is the manufacturing under pure conditions to the Sicherstellung of the process cycles� and the quality of the construction units indispensably. On room air quality the operational funds have a substantial influence, to which also coatings belong of grounds, walls and covers. In the following the different requirements are represented and the characteristics necessary for it of coating systems.� Requirements of clean-spacesuited fuel-relevant factors of influence on the purity of a pure area are apart from supply air quality,� Supply air bringing in,� Surfaces and that� Personal also in the area operational funds present [1]. To the operational funds among other things interior arrangements count such as walls, doors, covers and grounds. Substantial parameters of the pure space fitness from operational funds are depending upon use: - Emission of airborne particle degassing behavior (outgassing) - ESD characteristics Reinigbarkeit chemical and/or disinfectant stability smooth one and tear-free surface - Verstoffwechselbarkeit/Mikrobizidit�tF�r most production processes represent airborne particles the largest problem. Ever more however also AMC = airborne plays Molecular Contamination (airborne molecular contamination) a role. It concerns the presence of such molecular (chemical, not) substances in the gas or vapor phase within the atmosphere of a pure area or a pure space range, the one harmful effect on the product, the process, the equipment or the personnel to have itself can [2]. Degassings from the materials, of which the operational funds are made, like e.g. Coatings of the wall/cover/the ground, can have negative effects in not insignificant measure. Examples for this are corrosion effects of metallic conductive strips or - laminate, defects with Lithografie processes, shortened service intervals and life cycle times of optics, change of the electrical characteristics of Wafern by inadvertent doping [3]. In all past standards and guidelines for pure areas no test criteria are fixed for operational funds, among which also coating systems for grounds, walls and covers rank. There were only indirect referring to and/or the condition of the spatial air in pure areas, which can be received which can be manufactured, upright. Therefore pure space manufacturers specified and/or - operators due to experiences the criteria for systems in pure areas. Own testing methods were partly developed, how� z.B. by m+w group with their � specifications for semiconductor clean rooms � [4]. In order to compile and over for this products optimized develop testing methods for the pure space fitness from operational funds to, an alliance of the industry developed, � for Cleanroom Suitable of material (CSM) �, on initiative Fraunhofer of the institute for production engineering and automation (IPA), Stuttgart. Due to the realizations won in the industrial group CSM in the draft of the VDI 2083 sheet 17 (February 2011) test criteria for the pure space/purity fitness are described for the first time by materials.� Depending upon range of application the following demands are made against coating systems: - Property abrasion resistance (small particle formation) - property mechanical stability property chemical stability small degassing smooth one, nonporous surface property cleaning ability steady to disinfectant biostatically and/or. Mikrobizid derivative able tear-bridge-pure-spacesuited BeschichtungssystemeAm best suitably for the requirements in pure areas are epoxy resin systems, which worked particularly by their smooth, nonporous surface and a very good chemical stability. In addition they have a very good abrasion behavior and thus also a small particle formation during mechanical load, like e.g. going or vehicular traffic. Besides in the last years with the development of products by purposeful selection of the ingredients the degassing behavior was continued to improve.� The newest generation of epoxy resin dispersions and/or � emulsions contains, except water, hardly still volatile Anteile.Die StoCretec GmbH offers on the respective use co-ordinated coating systems for reinforced concrete, finery and gypsum cardboard undergrounds. Picture: Coatings on wall/cover/ground [1] VDI recommendation 2083 sheet 9. 1, December 2006 [2] VDI 2083, sheet 8,1, July 2009 [3] VDI 2083, sheet 8,1, July 2009 [4] M+W Group GmbH, Lotterbergstr. 30, 70499 Stuttgart

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