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  • Case Study

Protective Coatings Products and Standards

Protective coatings that meet our requirements are certified as UL Recognized Components and are published in UL Product iQ™ — just one more way that we can help you stand out from the crowd.

Cylinders of metal with protective coating


Protective coatings are covered under the following categories and corresponding category control numbers (CCNs) based on the type of coating and end-use application.

Coatings, Organic, for Steel Enclosures of Outdoor-use Electrical Equipment (DTOV2) – covers organic coatings, e.g., paints, enamels, lacquers and varnishes, intended for use as protection against atmospheric corrosion of steel enclosures in outdoor-use environments. The basic standard used to investigate products in this category is ANSI/UL 1332, the Standard for Organic Coatings for Steel Enclosures for Outdoor Use Electrical Equipment.

Coatings, Metallic (DTHW2) – covers metallic coatings, e.g., zinc, zinc-iron, aluminum-zinc, zinc-aluminum-magnesium and zinc-nickel alloy, and the steel substrates to which they are applied. The basic standard used to investigate products in this category is ASTM A653/A653M, Standard Specification for Steel Sheet, Zinc-Coated (galvanized) or Zinc-Iron Alloy-Coated (galvannealed) by the Hot-Dip Process. Additional standards may be used to investigate other metallic coating types/designations if found appropriate. 

Coatings, Organic, for Use on Metal-enclosed Switchgear Assemblies (DTZI2) – covers organic coatings intended for use as protection against corrosion of metal-enclosed, low-voltage-power circuit-breaker switchgears. The corrosion protection/coating (paint) qualification test requirements for these assemblies are outlined in UL 1558, the Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear, and ANSI/IEEE C37.20.1, IEEE Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear.


With expertise in safety science reaching back to 1894, UL Solutions is uniquely positioned to provide a complete view of how your products will function within a given system. This is particularly critical in the plastics and components industry. Interactions between substances, parts, systems and the environment can cause a significant number of hazards and failures, which are rarely apparent when components are tested individually.

Our technical experts can also help you align your products to the appropriate UL Certification category and applicable Standards. This enables manufacturers of UL Certified products to easily source components that demonstrably meet their compliance needs and project specifications.

Why UL Solutions

UL Solutions' comprehensive testing, certification, assessment and regulatory compliance services are designed to foster innovation, enhance product and process quality, enable safety and, ultimately, help our customers meet their business goals.

Our broad capabilities enable us to help you address a wide variety of key business needs that may arise throughout your product development life cycle and deployment phase. Working with one provider allows you to take advantage of our cost- and time-saving service bundles, and our integrated testing and certification plans allow you to achieve your go-to-market plans in a timely manner.

Even more so, we support you in your drive to protect public safety and brand value, mitigating your risk with quality assurance and supply chain compliance services. Our trustworthy reputation provides an important product differentiator in a crowded marketplace, communicating safety and quality to original equipment manufacturers (OEMs), purchasers and regulatory authorities.