Exploring advanced coating solutions for lasting UV protection

How Labsurface UV resistant epoxies with protective layer can match polyaspartic’s UV resistance

Exploring advanced coating solutions for lasting UV protection

How Labsurface UV resistant epoxies with protective layer can match polyaspartic’s UV resistance

In the world of epoxy coatings, combating yellowing due to UV exposure is a significant concern. Labsurface, a leader in high-performance coatings, aims to mitigate yellowing of all its topcoat epoxy products, but mostly, LABPOX 40 UV, LABPOX LV UV, and LABPOX LV 3D UV.

Even when using a clear protective coat (polyurethane, moisture cured or other aliphatic technologies), it remains important to use a UV resistant epoxy coating to slow down the yellowing process of the entire flooring system. Yellowing over time is expressed with the Delta E parameter, which measures the variation of color (yellowing) over time. For Labsurface, Delta E is an important metric to consider for aesthetic floors. In this article, we will better explain the significance of Delta E in flooring coatings, focusing on Labsurface’s commitment to aims to mitigate yellowing through UV-resistant formulations, and how Labsurface is leading the industry by disclosing Delta E values publicly.


Yellowing in epoxy coating is the result of radical oxidation under UV radiation in the presence of oxygen. The aromatic portion of the molecules are oxidized to form chromophores (such as carbonyl, quinone and other conjugated groups), thus resulting in the yellowing of the epoxy resin.


Delta E in flooring coatings signifies the degree of color change (yellowing), induced by UV exposure over time, affecting aesthetics and longevity. The ASTM D3424 Standard Test Methods establishes a standardized testing procedures to evaluate the relative lightfastness and weatherability. Lower Delta E values indicate minimal color deviation and superior UV resistance, ensuring long-lasting color integrity in epoxy coatings.

Through exposure to either natural daylight or accelerated laboratory simulations (minimum of 500 hours exposure), coatings undergo rigorous testing to assess their resistance to UV-induced yellowing. Labsurface adheres to ASTM (American Society for Testing and Materials) standards to ensure the reliability and accuracy of its UV resistance claims, providing customers with confidence in the performance of its products.

To provide a clearer understanding of how UV exposure affects epoxy coatings, the image displayed below offers a visual demonstration of the yellowing effect over time, quantified by Delta E values:

A Delta E below 2, as seen in the first comparison, is nearly imperceptible to the human eye, indicating minimal discoloration. As the Delta E values increase to 5, 10, 15, and 19, the degree of yellowing becomes progressively more noticeable and could significantly affect the aesthetic appeal and functionality of the coating.

How has Labsurface improved Delta E in its epoxy products?

Labsurface has developed innovative formulations to enhance Delta E values in its flooring coatings, thereby minimizing yellowing and preserving color integrity. Products such as LABPOX 40UV, LABPOX LV UV, and LABPOX LV 3D UV are engineered with advanced UV-resistant properties to withstand prolonged exposure to UV radiation without succumbing to yellowing. By prioritizing UV resistance, Labsurface empowers customers with durable and aesthetically pleasing flooring solutions for various applications. These improvements signify superior UV resistance and reducing yellowing effects. Labsurface aims to prolong the lifespan of flooring coatings and preserve their original color integrity, even in high-exposure environments.

For optimal UV protection and yellowing prevention, Labsurface recommends using protective layers such as LABFENDER, AQUALAB PUR, LABFAST series, and LABSHIELD ECO, designed to protect epoxy surfaces from UV-induced yellowing and degradation. As shown in the table below, Labsurface demonstrated that these products enhance UV resistance, which can compare to polyaspartic resins (delta E < 2). They also provide additional benefits such as improved stain and chemical resistance, ensuring the longevity and durability of flooring coatings.

Comparison of Delta E with and without a protective layer

Results obtained with ASTM D3424 methodology, under controlled laboratory environment. The protective layer was applied at a 5 mils thickness (wet) and results could vary depending on the actual thickness applied on a job site. Labsurface stands behind the quality of its products and the results could vary due to actual surface preparation, operating conditions, and application procedures.

Epoxy Coating Delta E
Delta E
(with protective layers)
LABPOX 30 10 2 5
LABPOX 40 UV 5 1 3

Why is disclosing Delta E values publicly significant for Labsurface?

Labsurface is one of the few companies in the industry to publicly disclose Delta E values. By sharing this information, Labsurface demonstrates transparency and commitment to quality assurance, empowering customers to make informed decisions about their flooring coatings. It is noteworthy that Delta E measurements for Labsurface products are prominently displayed in their Technical Data Sheets (TDS). These measurements provide customers with valuable information about the UV-Resistance of each product, enabling informed decision-making and ensuring the desired performance outcomes.

In conclusion, understanding Delta E is essential for evaluating UV-Resistance in flooring coatings. Labsurface’s commitment to enhancing Delta E values and offering high-performance protective coatings reflects its dedication to delivering superior quality and long-lasting solutions for various applications. By disclosing Delta E values publicly, Labsurface sets a standard for transparency and empowers customers to choose the right coatings for their needs, ensuring durability and aesthetic excellence in epoxy surfaces.