Lessons in Powder Coating: 1 or 2 coats

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In the world of powder coating, the question often arises: should we choose a single layer of 60µm, two layers of 110µm, with or without Seaside? And more importantly, when is it appropriate to apply which system? That is why we want to pay attention to this in our series 'Lessons in powder coating'.

The choice of the right application depends on the specific application and location. In areas with low to moderate air pollution and where the distance to the coast is more than 25 km, a single layer system with a thickness of 60 µm can be applied.

For projects in areas with heavy air pollution, such as heavy industry, or in the vicinity of the coastal strip (excl. coastal strip up to 2 km from the coastline), it is recommended to choose a double-layer system 110µm . In connection with ammonia emissions, this also applies to agricultural areas with intensive livestock farming in the immediate vicinity.

For projects located directly on the coast, a double-layer system 110µm including SEASIDE pretreatment is required.

See also article: (link to: https://coatr.eu/nl/kennisbank/lessen-in-poedercoating-qualicoat )

It is important to note that this explanation is specifically focused on the location of the project and the proximity of industrial activities. When using a double-layer system, an additional rounding radius is created on the edges of the object by applying a primer layer. As a result, the layer thickness on the edges, after the topcoat, is approximately 50% of the layer thickness on the flat parts, compared to only 15% with a single-layer system. This results in better coverage of the weak points of the object to be coated.

It is therefore recommended to use a double-layer system in aggressive (weather) conditions. In addition, the use of a double-layer system can compensate for possible weaknesses resulting from both the design and the pre-processing phase. A rounding radius of 0.5 mm must be taken into account in the design, so that a good layer thickness and protection can be obtained on the edges. In addition, the aluminium must be free of sharp edges and burrs when delivered to the powder coater. If this is not the case, a double-layer system can help to partially compensate for these weaknesses. A double-layer system results in a more robust system.

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