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Different Types of Powder Coat for Different Metals

Posted on: November 25th, 2016 by byersbushblog

Did you know that as early as 2010 the demand for powder coating in the global market has reached $5.8 billion?  This market has continuously delivered a rapid growth of about 6% annually, a trend that is projected to continue until 2018 at the very least.

Applied as a free-flowing powder, it does not rely on a solvent to maintain the binder and filler parts in liquid suspension.  This process is used mainly to give metals a strong, high quality coat that can last for decades.  What are the types of powder coat for different metals?

Types of Powder Coat

Typical powder coating techniques rely on two methods, thermoplastic and thermoset.  It is important to understand these methods before we get into the different metals.

  • Thermoplastic – the powder used for this type of coating will melt and flow once subjected to heat. The chemical composition of the powder will not change after it has cooled and solidified.  This is commonly applied to surfaces that have undergone preheating to temperatures that are excessively higher than the powder’s melting point.  The melting of the thermoplastic powder on the hot surface causes it to melt and fusion bond with the surface before it flows out as a strong and continuous film.  After the film cools it creates its own physical properties.  This method works mostly with nylon powder coating.
  • Thermoset –this type of powder melts likewise as it is exposed to heat, the difference is that it chemically crosslinks with itself or possibly with other types of reactive agents. The chemical structure of the cured coating changes from the basic resin used.  This process has coatings that are considered h eat-stable and will never soften even if reheated.

Working with Different Metals

It is important to understand that majority of the technological advancement in powder coating during the past few years have focused on thermosetting powders.  Thermoset materials can deliver a surface layer that is decorative and durable.  The powders have a more brittle resins allowing it to break up into very fine material that can be exceptionally fabricated into very thin and paint-like film that has variable properties to complement metal finishes.

What are the types of resins that allow thermosetting powders to work on different types of metals?  There are 4 generic types that make us this type of powder coating:

  1. Epoxy – hard with an impact resistant exterior, this coating is functional for the delivery of substrate protection. Aside from impact resistance, it is also corrosion resistant and provides essential adhesion.  The main drawback with this resin is its poor performance when exposed to weather.  This is normally used for automotive underbody components, industrial equipment, and, metal appliances and furniture.
  1. Polyester – this powder coat can be used in virtually all types of applications including various chemistries. It creates an extremely durable exterior that is consistent with the 2604 AAMA (American Architectural Manufacturers Association) specification standards.
  1. Acrylic – the automotive industry is the main user of this clear coat material. This resin leaves a smooth and clear coat that is hard and highly resistant to chipping, perhaps why automobile manufacturers prefer to use it.  Addition of this resin improves the flow and leveling including resistance to chemical stains.
  1. Fluoropolymer – this resin is the most ideal to be used on surfaces that are exposed to weather and UV rays. The architectural market is the main beneficiary of this type of powder coating primarily because of its durable finish that is known to last for an extremely long time.  Formulation of this resin can be done in such a way that it complies with the 2605 specifications of AAMA.

There are of course other factors and conditions that can determine how well powder coating methods can perform when subjected to the elements such as continued exposure to heat and humidity.  Equally important is to make sure that the process is carried out by a highly qualified powder coating company like Byers Bush.

Contact Byers Bush to get a high quality powder coat options that are suitable for your tools and give your valuable tools a longer life time value.

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