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Addressing a Major Industry Problem: Corrosion Under Insulation (CUI)

Corrosion Under Insulation
Corrosion Under Insulation has been a major problem in the marine, petrochemical and chemical process industries for many years. Due to the insulation's ability to trap moisture and hold it against the surface, corrosion-promoting atmospheres rapidly degrade most carbon steel substrates. As this developed, there became a need for high-performance coating systems under thermal insulation.

To help address this problem, testing programs were initiated to identify primers, coatings, and topcoats that would perform better and for longer periods of time in this severe environment. It was found that the key to solving CUI in the long-term is to identify a primer that can survive the exposure and work well with the insulation type material that did not promote moisture entrapment. As a result of the testing, an innovative approach using a combination of coating systems to provide protection and insulation has been used as a successful deterrent to CUI. Combined together, the coating systems protect, insulate and make inspection easy for areas under 350°F (190°C) or below.

The system includes both using a good primer system and a thermal insulation coating like Mascoat Industrial-DTI. Using a primer coating, such as the variety offered by Mascoat, over carbon steel substrates can ensure the first line of protection against moisture and corrosion. These primers provide excellent adhesion, as well as a tough barrier when applied directly to steel. They also have the ability to handle higher temperature applications without de-bonding. They must be used in conjunction with the second component to provide long-term performance.

The second component is the use of a thermal insulating coating. Mascoat has pioneered, developed and engineered a coating specifically designed to provide protection with insulating like qualities. Mascoat Industrial-DTI has been used for many years as a component in this type of system. The insulating coating is used to reduce the substrate temperature or provide insulating qualities in an easily applied format. By combining these two systems, a successful long-term solution is achieved as well as providing other unique advantages.


Mascoat has proven time and again since 1995 that MI-DTI combined with proven primer can prevent moisture intrusion and reduce ongoing, long-term maintenance associated with Corrosion under Insulation. Visit our Success Stories to learn more about our customers who have solved their CUI problems by using Mascoat.

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