Non-Convertible Coating

Definition - What does Non-Convertible Coating mean?

Non-convertible coatings are those coatings that cure or dry due to the evaporation of solvents. No chemical changes occur in the resins when a non-convertible coating transforms from the liquid to the solid state. Once applied, non-convertible coatings can be re-dissolved in the original solvent or a solvent with similar solvency power. Because of this ability these coatings are also known as thermoplastic material coatings.

Corrosionpedia explains Non-Convertible Coating

An aged or dry non-convertible coated film can be made soluble by the solvent or solvents in which it was originally dissolved. The film, which is made up of the solids of the coating formulation, does not undergo any chemical change upon drying.

The resins involved in the drying up of coatings become soluble only when subjected to large quantities of solvent. Therefore, in many parts of the world non-convertible coatings are limited by volatile organic compound (VOC) regulations. Some examples of non-convertible coatings are vinyl and chlorinated rubber.

There are several considerations when using these coatings:

  • The surface temperature must not be too high during application
  • Drying times are short
  • Avoid a high wind flow over the freshly coated surface
  • Avoid excessive film build
  • Ensure proper ventilation in the painting area

An advantage of these coatings is that once applied they form good intercoat adhesion and provide prolonged corrosion and oxidation protection.

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