Specifying Coil Coatings

By Administrator How to choose the coil coatings you&#;ll use Coil coating is the industrial process that coats metal before fabrication. Coil coated products can be used not only for building exteriors, but also for a variety of interior finish applications including walls and ceilings. &#;A prepainted finish will outperform every other type of painted&#; Continue reading

Specifying Coil Coatings

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By Administrator

How to choose the coil coatings you&#;ll use

Coil coating is the industrial process that coats metal before fabrication. Coil coated products can be used not only for building exteriors, but also for a variety of interior finish applications including walls and ceilings.

&#;A prepainted finish will outperform every other type of painted metal,&#; says Lou Katsampes, resolutions facilitator, CENTRIA Coating Services, Moon Township, Pa. &#;It has the most color consistency, it is environmentally green, it is durable and there are multiple reasons why prepainted metal is the first choice in painted metal. Colors can be customized and paint systems are specially formulated for specific environments. Additionally, many paint systems suited for architectural applications boast the longest warrantees offered by paint manufacturers.&#;

Coil coated metals can be printed, striped and embossed to create special visual effects. There is a wide range of high-performance, vibrant coating systems available that can be matched exactly to any color of choice. In many ways, coil coating has limitless design possibilities, many of which are virtually impossible with post-painted metal.

&#;Coil coated metals have come a long way since their humble beginnings in the manufacture of venetian blinds,&#; says Michael R. Bonner, vice president of engineering and technology, Saint Clair Systems Inc., Washington, Mich. &#;A wide variety of substrates are now available with an even wider variety of coating options. With so many combinations available to choose from, one is likely a perfect fit for virtually any architectural application. It makes sense that different substrate and coating combinations are better suited for different applications. These options make it possible to strike a balance between structural integrity, long-term durability and aesthetic appeal.&#;

&#;Each coating is formulated to provide a solution to a different architectural need,&#; says George Rosado, commercial director, Alcoa Architectural Products, Eastman, Ga. &#;Colors, gloss range, hardness, chemical resistance and UV durability all influence the selection of the primary paint system.&#; With the growing number of coil coated options available, what do architects and designers need to know that can assist them with their specification?

Selection and choices

When selecting and making choices, architects and designers should work with the entire supply chain team-from the metal supplier, paint supplier, coil coater and fabricator-to achieve the desired look and performance. Suppliers of coil coated products can provide detailed information on paint system specifications, recommended applications and product warranties. Most have information about their product offerings on their website.

&#;Most architectural metal product manufacturers list the types of finishes available in their product selections,&#; says Edwin Brantley Smith, AIA, president of
Edwin Brantley Smith & Associates Inc., Dallas. &#;Most specify a Kynar, Hylar or Duranar finish, which are generically known as 70 percent Polyvinylidene Difluoride (PVDF) coatings. These types of finishes are typically coil coated materials due to the controlled aspect of the color application.&#;

When looking at options, be aware that there are two types of coaters: captive and toll. &#;The toll coater is a service coater that works for many manufacturers who ultimately form the end products,&#; says Smith. &#;Captive coaters are usually an in-house operation. The steel- and aluminum-producing companies are captive coaters and typically have their own operations as part of the manufacturing process.&#;

Color your choices

With a wider assortment of colors now available, specifiers have more to choose from. &#;Architects and designers must determine what look they desire,&#; says Peter Jahn, senior project engineer, Chicago Metallic Corp., Chicago. &#;There are a variety of colors available, including both solid and metallic, prints and textures.&#; Coil coated metals maintain color consistency, are low- to no-maintenance, and are the easiest to fabricate for permanent applications of color to architectural metals.

&#;We always specify coil coated metals for panel products used in our design pallet,&#; Smith says. &#;We know the product arriving for installation will be the same color as the approved samples, which is critical to maintain the designed aesthetic. Coil coated metals provide uniformity of color on multiple exposures year after year.&#;

Today&#;s continuous coil coating processes can produce unlimited quantities of material with this uniform color, from run to run, and maintain that consistency of color on diverse products ranging from Aluminum Composite Material (ACM), to profile materials and flat sheet fabricated for flashing materials. &#;Custom finishes are also easily achieved,&#; says Rosado. &#;Wood grain pattern paint finish can be produced in virtually any color and can be ordered in quantities as small as 4,000 square feet or large enough to meet the needs of custom branding programs.&#;

Whether or not to add a clear coat is important too and it affects color. A clear coat helps protect the color from chalking and fading, minimizes the accumulation of dirt and helps protect the surface from chemical fallout or salt spray.

Contact us to discuss your requirements of wooden coil. Our experienced sales team can help you identify the options that best suit your needs.

End use affects selection

The metal&#;s application and end use affects selection. &#;From solar reflectivity to ocean-side environments, many factors can affect all paint finishes and the toll coater needs to know about any special requirements the building may have,&#; says Katsampes. Toll coaters can assist in making decisions with choosing a paint system suitable for the end use.

Architects and designers must make selections based on weathering. &#;This primarily includes chalking and fading of the color over time, as well as any special environmental concerns such as coastal exposure,&#; says Jahn. &#;They also need to know if the project intends to follow green design guidelines, such as Energy Star or LEED, which may have criteria recognizing no-VOCs and lasting durability. Certain coil coatings and paint finishes perform well on cladding, exterior wall panels and trim. Others are recommended when the project requires bright, vibrant colors and the higher glosses used for corporate imaging. Some premium, high-performance coatings can exceed American Architectural Manufacturers Association (AAMA) -98 requirements for long-term durability and performance to provide excellent flexibility and film adhesion for forming superior resistance to salt sea spray, humidity, impact, pollution and abrasion. Performance from a weathering standpoint, along with formability properties, usually determines the paint system.

&#;PVDF coatings, such as Kynar, will provide the longest color and gloss retention,&#; says Jahn. &#;PVDF coatings also can be the most expensive. Polyester and acrylic coatings may be the least costly, but they do not provide the same level of performance. Silicone-modified polyester (SMP) coatings and newer super-polyesters provide performance and a cost somewhere in the middle.&#;

How wil it be formed?

When specifying, architects and designers should consider the the materials&#; formability properties, such as the stamping, embossing and rollforming actions that are necessary to manufacture the desired parts. This includes determining T-bends, impact and hardness.

 &#;When the material is stamped, perforated, punched and cut, it&#;s important to be aware of the new surface created on the interior or edge,&#; says Jahn. &#;If this new surface is not properly finished, it can corrode. With steel substrates, this can result in noticeable rusting and run-off, potentially damaging surrounding materials. If the material is post-painted, be aware that the finish will reduce the diameter of the cut openings, which may affect the ease of installation and present an aesthetically different appearance than coil coated material.&#;

New developments

New developments are happening all the time with performance gains in pigments and resin systems. By involving the entire supply chain, the latest developments in coil coatings can be considered along with the field-tested solutions that are in use every day. &#;Alcoa Architectural Products often collaborates with architects to create a unique paint finish that will help them realize their vision for a project,&#; Rosado says. &#;In fact, a number of patterns and textures featured in the Design Line portfolio were originally created for specific projects.&#; Again, product manufacturers will always be there to answer questions about new coil coatings and their specific applications that meet the needs of a project.

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Ask the Association

Metal Architecture asked the National Coil Coating Association to describe in its own words how architects can best specify coil coatings.

Designers and architects will probably be surprised by the variety of aesthetics capable of being produced by coil coated metals. Metal can be coated not only with traditional solid colors, but also with metallic colors, pigment changing coatings, prints that range from wood grain looks to artificially patina&#;d metal looks and bright colors as well. Prepainted metal can also be embossed, coined, stamped or texturized to create a wide variety of looks.

By now, everyone knows that coil coated products are durable, recyclable and able to meet the Energy Star and cool roof requirements. Not everyone may know about newer special coatings. For example, you can specify lowsheen products that reduce glare from the afternoon sun; perfect for airports or areas around a highway.

Designers and architects should work with their metal supplier or paint supplier to achieve the right look for their project. The National Coil Coating Association&#;s website is also a great resource for general information or to find a supplier member. Our web address is www.coilcoating. org.

Coatings are available in a wide variety of technologies and your coil coater or building supplier can help you decide what technology is right for your project. Polyvinylidene Difluoride
(PVDF) and Fluorinated Ethylene Vinyl Ether (FEVE) resins will generally provide the longest color and gloss retention, but are not necessarily right for every project. The National Coil Coating Association has prepared a video titled Paint 101 available under the education heading on our website. This short video introduces the viewer to all of the standard paint technologies used in coil coated metals. We have other materials available under education that address coatings, as well. For example, Tool Kit #8 provides information about various top coat systems.

Laura Lanza is the director of sales, marketing and business development at Lincolnshire, Ill.-based Nichols Aluminum, and chair of the National Coil Coating Association.

As painted aluminum specialists, we are well-known for our extensive color selection for polyester painted aluminum sheet and coil. We have over 35 stock polyester paint colors available and are able to provide various types of custom orders. If your project requires painted cold-rolled or galvalume, we provide those materials upon request. We also provide alternative paint systems, such as Epoxy and Acrylic.

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