What causes epoxy to change colors over time?

Epoxy can change color over time due to several factors:

1. UV Exposure: One of the main causes of color change in epoxy is exposure to ultraviolet (UV) light. Epoxy is sensitive to UV radiation, and prolonged exposure to sunlight or artificial UV sources can cause it to yellow or discolor. This is particularly evident in epoxy surfaces that are exposed to direct sunlight or in areas with intense lighting.
2. Oxidation: Over time, epoxy can undergo oxidation, which can lead to changes in color. Oxidation occurs when the epoxy reacts with oxygen in the air, causing the surface to become discolored or yellowed. This can be more noticeable in epoxy surfaces that are exposed to high levels of oxygen, such as outdoor or well-ventilated areas.
3. Heat Exposure: Epoxy can be sensitive to high temperatures, and prolonged exposure to heat or hot objects can cause it to change color. The heat can accelerate chemical reactions within the epoxy, leading to discoloration or a shift in color. This is particularly relevant in areas exposed to heat sources like hot pans, welding sparks, or industrial processes.
4. Chemical Reactions: Epoxy can undergo chemical reactions with certain substances or chemicals, which can cause it to change color. Exposure to certain cleaning agents, solvents, or chemicals that are incompatible with epoxy can result in discoloration or alteration of the epoxy surface.
5. Age and Wear: Over time, epoxy floors can experience wear and tear, which may lead to color changes. Foot traffic, furniture movement, or friction from objects can cause abrasions or micro-scratches on the epoxy surface, altering its appearance. Additionally, general aging and degradation of the epoxy material can contribute to color changes.

To minimize color changes in epoxy over time, consider the following measures:

1. UV Protection: Use epoxy coatings or topcoats that are specifically formulated to be UV-resistant. These products contain additives that help protect the epoxy from UV radiation and reduce the risk of yellowing or discoloration.
2. Proper Maintenance: Regular cleaning and maintenance of the epoxy surface can help preserve its appearance. Promptly clean up spills, avoid using harsh chemicals or abrasive cleaning agents, and follow recommended cleaning practices to prevent potential chemical reactions or damage.
3. Protective Topcoats: Applying a protective topcoat or sealer over the epoxy can provide an additional layer of protection against UV radiation, chemicals, and general wear and tear. These topcoats can help prolong the color stability and enhance the overall durability of the epoxy surface.

It’s important to note that while these measures can help reduce the likelihood of color changes in epoxy, they may not entirely eliminate the possibility. Factors such as the quality of the epoxy materials used, installation techniques, and the specific environmental conditions can all impact the long-term color stability of the epoxy floor.