Three questions to answer when choosing the right metal coatings for your next coil project
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Metal coatings are engineered for performance and aesthetic capabilities to maintain the integrity of metal – one of the most important materials in architecture. Left uncoated, metal is susceptible to the elements and can eventually degrade. Metal coatings prevent degradation by providing a durable barrier that extends the overall lifespan of the metal substrate.
Choosing the right metal coatings for a metal building product or project largely depends on the environment in which the product and structure will live, but before the application stage, architects, product manufacturers and OEM-specifiers should ask themselves the following questions.
1. What is the coating application – coil or extrusion?
Selecting the right metal coating system for your project depends on the type of metal substrate and its end-use. For example, are you fabricating metal roofing made of Galvalume® or aluminum windows?
The end-use denotes the type of coating application – coil or extrusion. The biggest difference between coil and extrusion coatings is how and when they are applied. Coil coatings are applied to coiled sheets of metal before they are formed, while extrusion coatings are spray applied after the aluminum extrusion has been formed.
The product application is highly important when choosing the right metal coating, as each coating is formulated to fit each unique use.
In our portfolio there are several wetting & dispersing additives which are especially suitable for coil coating application.
These wetting & dispersing additives can be used to disperse and stabilize all kind of pigments.
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It is recommended to prepare white mixtures (e.g. white with carbon black, with iron oxide red, with phthalo blue etc.)
The color stability should be tested performing a rub out test. Additionally the high speed stirring stability should be tested.
These white mixtures need to be applied, rub out and high speed stirring stability should be tested, too.
Of every sample the storage stability should be tested. This can be done by storing the samples in the oven for at least three days at 50°C.
After storage the samples should be applied again the same way as done before storage.
A well dispersed and stabilized samples should have a delta E below 0.5 and a good leveling. After storage gloss and color stability should be the same as before storage.
We recommend testing DISPERBYK-110, DISPERBYK-180 for titanium dioxide and inorganic pigments. DISPERBYK-170, DISPERBYK-2013 and DISPERBYK-2025 can be used for all kind of pigments including carbon black.
In the best case all pigments can be stabilized using only one additive. But often a combination of two wetting & dispersing additives is required. For example DISPERBYK-110 could be used for titanium dioxide and inorganic pigments and DISPERBYK-2025 could be used for organic pigments.
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