2.3 - Environmental Protection
2.3 Environmental Protection
2.3.1 VOC provisions
The publication of the Paint Guide coincides with the use of new materials for repair paint build-up.
Processing of materials containing zinc chromate has been legally restricted to a very large extent or completely forbidden for reasons of health protection.
In order to achieve the exceptionally high corrosion inhibition effect of materials containing zinc chromate by means of products without zinc chromate, the individual materials of the paint build-up must be exactly matched to each other. Only the combination produced in this way affecting the whole paint build-up permits the corrosion inhibition effect required for the long-term warranty of the Porsche models to be achieved. For the paint sprayer, this means that he must follow the material and processing instructions in the Paint Guide exactly.
A further advantage of this combination build-up is its clarity. Thanks to the homogeneity of this build-up, only a minimum of materials is required (hardener, thinner). Possible errors resulting from mixing the paint materials with incompatible hardeners and/or thinners are thus largely excluded.
With the '86/'87 model change, the metallic topcoat paints used for series paint finishes on the models 911 and 928 were gradually converted from the conventional "low-solid" (LS) systems to "medium-solid" (MS) systems. This change was necessary in order to enable compliance with the legally prescribed maximum permitted emission values related to the solvents released during spraying, airing and drying. The respective color shades are produced for repair painting on these vehicles in conventional LS quality. However, practice has shown that observation of color matching with tolerable differences is sometimes difficult and that it is therefore necessary to take into account the different paint systems for repair painting.
Since repair painting can pass the customer's critical observation only if the result is perfect, the "blending technique" must be used for unacceptable shade differences between the series paint finish and the repair paint finish.
VOC materials
Due to existing legislation, it is absolutely necessary to comply with the highest permissible emission values of organic, volatile substances in industrial paint finishing (works finishing). Solvent emissions are caused, for example, by the vaporization of all solvents released by and during the painting process and which are produced, for example, during spraying, airing, drying and during the cleaning of work equipment.
In order to be able to observe the respective limit values, measures have been (are being) taken that relate both to the equipment and to the paints themselves, and often to a combination of both. Therefore, high-solid (HS) and water-based paint products are increasingly being used in series paint finishes (organic solvents have largely been replaced by deionized water).
Also in terms of the processes involved, high paint yields are being achieved and as a result, solvent emissions are being reduced through the use of the electrostatic spray procedure, for example.
Even for the repair paint sector, corresponding restrictions are to be expected or are already in force in the form of relevant VOC laws/administrative guidelines (VOC = volatile organic compounds), such as:
At a European level, the EU Council of Ministers passed the enforcement of a VOC guideline on 31.03.1999. This means that all affected paint shops (both existing and new) must now comply with these limit values.
The limit values laid down in the above-mentioned VOC guideline include the maximum permissible solvent emission quantities per year and per paint shop (e.g. 500 kg) and the maximum solvent content (e.g. 420 g/liter) of the individual paint products in their ready-to-spray state.
As an equipment-based solution for the repair paint sector can be excluded for reasons of cost, compliance with the limit values can only be achieved through corresponding paint products (HS and water-based products) and through a spray technique with a high level of efficiency (e.g. HVLP spray technique = High Volume Low Pressure/painting technique with reduced levels of spray mist).
3.1 - Paint Finishes For Porsche Vehicles