Note: This is the second of a series of posts covering the definition, development and properties of flow efficiency coatings. Click the button at the bottom of this post to download the full PDF.
Flow efficiency coatings: A history
For years, the most common formulations of flow coatings were based on low solids epoxies. But recent regulations governing VOCs emissions at the regional, national and international levels have made these formulations difficult or impossible to use. In response, some companies have begun to experiment with new formulas for internal pipe coatings.
Water-based epoxies emerged early as a potential solution, but problems have surfaced. Water has proven difficult to remove once the coatings have been applied. This makes climate a major factor in the application process. In predominantly humid environments, water-based coatings have a tendency not to dry at all.
Plural-component, 100 percent solids coatings have superseded water-based epoxies as a solution to the problem of flow efficiency coatings and emissions regulations. These have been shown to have quick cure times, regardless of weather conditions. Even in rain, 100 percent solids tend to dry. And of course, because they contain no solvents, they comply with even the strictest regulations.
It is true that some investments must be made in order for an operation to make use of plural component coatings. Pumps and other application equipment are on consideration. The products themselves are generally about twice as expensive, as well. This turns into a relative wash, though, because they also tend to cover twice the surface area of lower solids coatings, so about half as much product is required. Waste is also a non-issue, since plural component coatings are not mixed until the moment before they are applied.
These benefits make 100 percent solids a viable option for use as flow efficiency coatings. But there is another benefit high solids coatings can bring to flow efficiency that may ultimately tip the balance in favor of the cost-effectiveness of these types of coatings. In our next post, we’ll be discussing how, and why, corrosion-resistant properties can be combined for ultimate utility.