Demands in the automotive industry regarding the hygiene and cleanliness in manufacturing facilities has been growing in accordance with the employment of new technologies and products, such as LED-based headlights for example, in the recent years.
The field of clean production in the automotive industry is covered by the VDA standards. This identifies and prescribes all the processes that are required in a specific cleanliness class. There are four such classes: CG0, CG1, CG2 and CG3. The CG class is the uncontrolled class, CG1 includes separation of the area from outside environment’s effects by means of floor markings, curtains etc. The design of ventilation system is a general one. The CG2 class has a fixed barrier separating the cleanliness area from the external environment and also has a general ventilation system. The CG3 class employs a fixed separation of the clean area from the outside environment and In addition a special “clean air” ventilation system, with the system essentially being constructed as a separate room inside the facility. The methodology employed for class identification is the measurement of density (g/cm3) and size (µm) of particles with the use of the so-called »dispersibility« diagramme.