Why do white road marking paints turn yellow?

Understanding the impact of material quality, environmental influences, and application methods is key to addressing the yellowing of what should be durable and safe road marking.

There are usually three main reasons for the yellowing of white road marking lines:

1 Resin Quality Matters:

The quality of the resin in road marking paint is crucial for the paint’s performance and longevity. Petroleum resin, often used in thermoplastic road marking paint, must meet specific purity standards to ensure the paint’s effectiveness. When the resin falls short of these standards or is contaminated with impurities, the paint’s integrity is compromised, leading to issues such as yellowing of the initially applied white lines. This outcome is not unexpected, given the inferior quality of the resin. To maintain the vibrancy and clarity of road markings, it’s essential to use high-quality petroleum resin that adheres to the required specifications, thereby preventing discoloration and ensuring the paint’s optimal performance.

2 Titanium Dioxide Deficiency:

There is not enough titanium dioxide in the road marking paint, which cannot effectively guarantee the whiteness of the paint. Therefore, it is recommended to choose high-quality road marking paint for construction to avoid various unnecessary troubles.

3 Avoid Overheating:

Excessive heat during the application of road marking paint can result in discoloration, particularly when the resin in the paint is exposed to temperatures around 200°C. This degradation not only impacts the paint’s longevity but also its visibility, which is crucial for traffic safety. To prevent such issues, it’s vital to follow the manufacturer’s guidelines for heating road marking paint. Proper temperature management ensures the paint maintains its reflective properties and durability, providing clear guidance for drivers and contributing to a safer driving environment.

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