Coating formulators usually have to find a balance between several properties, like
flexibility and hardness. Coil coatings for instance must be extremely flexible
so that the coated strips can be cut and shaped, without any damage to the coatings.
But coil coatings used for building components have to be hard enough to avoid dirt
1K stoving polyurethane coatings are well known in the coil coating industry for
their unique balance between hardness and flexibility.
|Balance of Hardeness
||--: very poor
Figure 1: Part of a Coil Coating Line
Polyurethane coatings are flexible enough to withstand intensive layout of the coated
material without damages
In coil applications, the metal sheet is coated before being converted to the finished
products. This industrial processing exposes the coating to a rough treatment.
Thanks to their flexibility, polyurethane paints can be embossed without cracking,
chipping or being scratched.