HEAT-FLEX® ACE

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ADVANCED CUI EPOXY

Page last modified

August 1 2025

Heat-Flex® ACE is a next-generation ultra-high solids advanced novolac epoxy for Corrosion Under Insulation (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 offers 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, operating between temperatures from -196°C (-321°F) to 232°C (450°F), and is suitable for use in new construction and maintenance projects of both carbon and stainless steel substrates, in insulated and uninsulated service.

BENEFITS
ACE resin technology delivers unrivalled properties that meet the expectations of both the owner and the applicator, providing a more dependable and longer lasting organic coating solution to mitigate the risk of CUI.

Unparrelled performance -more dependable – longer lasting

• Best in class - CUI temperature resistance
• Excellent corrosion creep resistance
• Outstanding resistance to chemicals and variable pH levels experienced in CUI service
• Superior resistance to erosion, cracking, and mechanical damage

Highly versatile - highest throughput in shop and field

• High build capability, one or two coat systems without cracking
• Airless, plural-spray, conventional spray, brush,and roller application
• Wide Dry Film Thickness (DFT) range
• Specification simplification

Environmentally friendly - reducing carbon footprint

• Most versatile 100% solids CUI product on the market

• Reducing solvent abatement issues or processes in shop
• Safer in shop application due to being solvent free
• Lowest VOC (<100 g/l)

Heat-Flex® ACE has been tested against environments up to ISO 12944-9 CX, direct to metal with no pre-heating, and passes these requirements without a topcoat. Excellent corrosion creep result of <4.5 mm without a topcoat, which is exceptional for 100% solids products.

Pros & Limitations

Can withstand higher elevated temperatures, protecting from corrosion during service, and resisting the variable chemical environment found under insulation.

Heat-Flex® outperforms all coatings tested normally used in CUI service to 205°C (401°F).

Heat-Flex® ACE does not show degradation, maintaining protective properties at temperatures well above 205°C (401°F).

Excellent results conforming to category CUI3 – exceeding 205°C (401°F). Sherwin-Williams conducted numerous third-party durability testing, including
ISO 19277 ‘Houston CUI Simulation Testing’.

Specification

Title	Description
Theme/Discipline	PipelinesIntegrityBlasting & CoatingCorrosion Management
Core Tech	Paint/Coating
CUI	Can withstand higher elevated temperatures, protecting from corrosion during service, and resisting the variable chemical environment found under insulation.
Pipe test	Excellent results conforming to category CUI3 – exceeding 205°C (401°F). Sherwin-Williams conducted numerous third-party durability testing, including ISO 19277 ‘Houston CUI Simulation Testing’.
environmental	Lowest VOC (<100 g/l)