HEAT-FLEX® CUI-Mitigation and Elimination Coatings

Designed to Withstand Harsh Conditions Before and During Service

On average, 60 percent of all insulation in service for more than 10 years will contain corrosion-inducing moisture, which will result in corrosion under insulation (CUI). In fact, studies show that organic protective coatings in CUI service last from a range of 5 to 13 years.

Traditional CUI coatings fail prematurely under insulation as they have limitations handling the service and pre-service environments. Water, alkali, chlorides, and elevated temperatures in the service environment lead to highly corrosive environments, while improper coating thickness may lead to insufficient barrier protection or cracking. In the pre-service environment, shipping, handling, construction, and exposure to highly corrosive environments can prematurely deteriorate a coating.

With that in mind, Sherwin-Williams Protective & Marine has developed a product range to best mitigate - or even eliminate - the dangerous condition of CUI with our new line of Heat-Flex coatings.

This next-generation CUI portfolio has passed extensive lab testing and displays good to excellent performance in a variety of tests.

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MICACEOUS IRON OXIDE (MIO) HElps address CUI Failures

To better meet the needs of current CUI-mitigation specifications, Sherwin-Williams enhanced three formulations by adding MIO reinforcements. Each coating features a minimum concentration of 25% MIO pigment by weight in the dried coating film, helping to extend the life of the coatings and reduces risk by addressing typical CUI failure mechanisms experienced while in service and during shipping and construction.

Browse a few of our recommended products below and contact us to learn which products are ideal for your application.

Micaceous Iron Oxide (Mio) Coatings

Heat-Flex® 750

MIO-Enhanced Alkylated Amide Epoxy

This coating consistently outperforms comparable alternatives in terms of heat, corrosion, erosion, and thermal shock properties. A variety of accelerated testing methods have shown that Heat-Flex 750 outperforms traditional epoxy phenolics and other AAE technologies in a CX environment with no adhesion loss, an excellent rating for rust and blistering, as well as excellent heat and crack resistance at high DFTs, and minimal chalking and DFT erosion. The product's high solids and fast dry times make it ideal to increase productivity.

Suitable for CUI temperature ranging from -196°C (-321°F) to 205°C (401°F)

Superior corrosion protection in CX environments

Excellent UV erosion resistance

Unrivaled crack resistance at elevated and cryogenic temperatures

High solids

Low VOCs

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Heat-Flex® 1200 Plus

MIO-Enhanced Multi-polymeric Matrix Coating

As a two-component version of the company’s original Heat-Flex 1200 coating, Heat-Flex 1200 Plus provides added mechanical resistance and corrosion protection in atmospheric environments. Heat-Flex 1200 Plus is ideal for insulated pipes, valves and process vessels that face high-temperature service and aggressive cyclic service at high temperatures.

Suitable for CUI temperature ranging from -196°C (-321°F) to 649°C (1200°F)

Superior corrosion protection in CX environments without heat or zinc

Excellent hardness vs. inorganic copolymers

Improved mechanical resistance

Unrivaled crack resistance

Short recoat windows

Low VOCs

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Advanced CUI Epoxy Technology

Heat-Flex® ACE

Ultra-high Solids Advanced Epoxy Novolac

Heat-Flex ACE is a next-generation ultra-high solids advanced novolac epoxy for CUI. Developed with a functional chemical enhancement, surpassing performance capabilities of traditional solvent-based epoxy phenolic and novolac coatings. This advanced CUI epoxy technology is unique and different from other epoxy chemistries, as it gives unrivalled performance and application properties through the robustness of the resin system, rather than through pigmentation. Heat-Flex ACE provides external protection of process pipes, valves, and vessels for use in new construction and maintenance projects of both carbon and stainless-steel substrates in insulated and uninsulated service.

Suitable for CUI temperature ranging from -196°C (-321°F) to 232°C (450°F)

100% solids CUI epoxy novolac

Excellent UV erosion protection

Excellent corrosion protection in CX environments

Superior resistance to CUI chemical environments

Heat-Flex 7000 - Say goodbye to CUI with our award winning thermal insulative coating

New generation thermal insulative coating that can replace traditional insulation methods

Heat-Flex 7000 is a one component thermal insulative coating system that offers personal protection, solar heat reflectivity and resultant insulation capabilities for an array of industrial applications. This single-component, spray-applied coating system meets standards for protecting personnel from skin-contact burns on assets operating at temperatures up to 177°C (350°F) in one coat applied at 1150 microns.

Heat-Flex 7000 can replace conventional cladding and insulation systems, thereby eliminating the risk of CUI. Click the link to learn more.

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Heat-Flex Product Information Sheets

Heat-Flex® 7000 Product Information Sheet

Download PDF 493 KB

Heat-Flex® 1200 Plus Product Information Sheet

Download PDF 582 KB

Heat-Flex® 750 Product Information Sheet

Download PDF 467 KB

Heat-Flex® ACE Product Information Sheet

Download PDF 426 KB

Additional Languages

Heat-Flex® 750
A two-component, high solids micaceous iron oxide filled alkylated amide epoxy coating.
Heat-Flex® 1200 Plus
A two-component, micaceous iron oxide, inert multi-polymeric matrix coating.
Heat-Flex® Hi-Temp 1200
A single component, self-priming, inert multi-polymeric matrix coating.
Heat-Flex® 7000
A single component, waterborne, acrylic thermal insulative coating.
Heat-Flex® ACE
A two component epoxy novolac CUI and high heat coating

Heat-Flex CUI-Mitigation Coatings Overview

Duration - 4:5

00;00;07;03 - 00;00;08;03 Hello, everyone. 00;00;08;03 - 00;00;12;06 I'm Bruce Toews the global market energy director here at Sherwin-Williams, 00;00;12;14 - 00;00;16;15 and I'm here with Mark Rubio, our energy business manager, to talk about 00;00;16;15 - 00;00;20;18 our new enhanced product line to mitigate corrosion under insulation 00;00;21;07 - 00;00;23;22 as one of the world's leading coatings companies. 00;00;24;03 - 00;00;27;10 Sherwin-Williams is always searching for new ways to improve the products 00;00;27;10 - 00;00;29;24 and services we offer to our customers. 00;00;30;12 - 00;00;33;08 And I'm proud to say that Sherwin-Williams pioneered coatings 00;00;33;08 - 00;00;36;24 for under insulation applications in 1999, 00;00;37;03 - 00;00;41;27 with the introduction of both and Flake filled a phenolic Novalac epoxy. 00;00;42;15 - 00;00;45;29 Then in 2012, we launched the second generation 00;00;45;29 - 00;00;48;17 CUI coating heat flex 1200. 00;00;49;11 - 00;00;52;00 Having decades of relevant industry experience. 00;00;52;01 - 00;00;57;00 Today we take another step forward, expanding our CUI mitigation product range 00;00;57;10 - 00;01;01;03 by introducing a micacious iron oxide enhanced product line 00;01;01;13 - 00;01;06;18 as well as a completely new solvent free advanced CUI epoxy. 00;01;07;10 - 00;01;10;29 Our new enhanced product line can be split into two categories. 00;01;11;14 - 00;01;15;21 Now I'll turn to Mark, who can describe them Absolutely Thank you, Bruce. 00;01;16;06 - 00;01;19;20 The first category is an upgrade of our existing product line, 00;01;19;20 - 00;01;24;22 with products enhanced with my micaceous iron oxide, otherwise known as MIO. 00;01;25;20 - 00;01;26;00 All our 00;01;26;00 - 00;01;30;02 products in this category have a minimum of 25% MIO 00;01;30;02 - 00;01;33;19 into dry film, which is key for performance. 00;01;34;01 - 00;01;36;22 First we have Heat Flex 650. 00;01;37;11 - 00;01;42;15 This is our next generation two component epoxy phenolic enhanced with MIO 00;01;42;24 - 00;01;45;14 to provide improved mechanical properties. 00;01;46;17 - 00;01;49;09 Second is our Heat Flex 750 00;01;49;26 - 00;01;53;04 a new chemistry in our portfolio. 00;01;53;04 - 00;01;57;06 This is an athlete amide epoxy also enhanced with MIO 00;01;57;16 - 00;02;01;03 with exceptional corrosion erosion and crack resistance. 00;02;02;10 - 00;02;04;22 And to complete our MIO Enhanced product 00;02;04;22 - 00;02;09;03 line, we're introducing Heat Flex 1200 plus, 00;02;09;19 - 00;02;13;21 which is a two component inert, multi polymeric matrix coating 00;02;14;02 - 00;02;17;17 with improved corrosion protection properties as well as being more 00;02;17;17 - 00;02;19;21 resistant to mechanical damage. 00;02;20;18 - 00;02;21;20 That's great, Mark. 00;02;21;20 - 00;02;23;16 Now, can you talk about the second category? 00;02;23;16 - 00;02;24;24 Oh, absolutely. 00;02;24;24 - 00;02;29;09 Our second category is the introduction of a unique technology and product. 00;02;30;04 - 00;02;33;13 We're happy to announce the introduction of heat flex, Ace 00;02;33;29 - 00;02;36;08 and Advanced CUI epoxy. 00;02;36;29 - 00;02;39;29 This product is a 100% solid epoxy novalack 00;02;40;09 - 00;02;43;29 developed with a functional chemical enhancement. 00;02;43;29 - 00;02;45;04 Years of testing. 00;02;45;04 - 00;02;47;29 Show that heat flex ace is best in class 00;02;47;29 - 00;02;51;03 in heat resistance being solvent free. 00;02;51;03 - 00;02;54;19 It reduces carbon footprint as low as VOCs 00;02;54;28 - 00;02;58;02 and makes it safer to use in the shop and field. 00;02;58;27 - 00;03;03;24 In addition, the product also exhibits excellent application properties 00;03;04;02 - 00;03;07;19 with a much broader dry film thickness range than what's currently 00;03;07;19 - 00;03;08;24 available on the market. 00;03;09;23 - 00;03;10;25 G Flex Ace 00;03;10;25 - 00;03;14;15 is suitable for temperature exceeding 400 degrees Fahrenheit, 00;03;14;24 - 00;03;18;22 which makes this the best coating to mitigate CUI on the market. 00;03;19;24 - 00;03;23;20 All together we're very happy to announce and introduce 00;03;23;20 - 00;03;26;18 this four new products to complete our enhanced product line. 00;03;27;18 - 00;03;28;22 Thank you, Mark. 00;03;29;06 - 00;03;32;09 Overall, the Heat Flex products are designed to withstand harsh 00;03;32;09 - 00;03;36;06 conditions before and during service from shop to field. 00;03;36;24 - 00;03;39;10 Our extensive service, history and performance 00;03;39;10 - 00;03;42;05 testing, coupled with much improved application properties, 00;03;42;11 - 00;03;46;11 will prolong coating service life with these four products. 00;03;46;18 - 00;03;49;09 Sherwin-Williams provides customers with multiple options 00;03;49;16 - 00;03;52;23 for CUI mitigation to meet your specific needs. 00;03;53;10 - 00;04;01;20 Thank you.

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HEAT-FLEX® CUI-Mitigation and Elimination Coatings

Designed to Withstand Harsh Conditions Before and During Service

Contact Us for More Information

Advanced CUI Epoxy Technology

Heat-Flex® ACE