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Analysis of Combustion Phenomena in Product Color and Coating Tests

2026-03-20

Today, the editor of tunnel fire‑proof coatings will provide an analysis of the phenomenon observed during product color and coating tests, in which a small amount of combustion is detected on the back side.

First, let’s start with the product color.

The primary raw material of the coating, the flame retardant, is colorless. The coating’s color—white—depends on the amount of titanium dioxide used as a filler; excessive use of titanium dioxide can compromise the coating’s performance.

Now, let’s talk about coating analysis.

In comparative combustion tests, the coating exhibited slight burning. From a raw-material perspective, the coatings they use employ low-boiling-point solvents (such as toluene and xylene), whereas Shanghai Pinghai Coating Co., Ltd. utilizes high-boiling-point, environmentally friendly solvents with a longer evaporation time. Consequently, solvent ignition can still occur before the coating is fully dried. Additionally, Pinghai’s fire‑retardant coatings contain a certain amount of plasticizer, which enhances coating flexibility and further reduces the rate of solvent evaporation, thereby extending the full‑drying time. However, this results in improved workability, reduced material waste, and superior coating durability.

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