What happens during the gel stage of powder coating?

During the gel stage of powder coating, the particles begin to gel and convert to solid. This phase is crucial in the powder coating process as it marks the transition of the powder from its original, free-flowing state into a more solid form. The gel stage is characterized by the softening of the powder particles due to heat, which allows them to adhere to one another and start forming a continuous film.

As the powder reaches the gel state, the individual particles coalesce and become interconnected, creating a gel-like consistency. This process is essential because it lays the groundwork for the subsequent curing phase, where the coating will eventually cross-link and harden into a durable finish. Understanding the gel stage is key for coating inspectors, as it informs them about the behavior of the material during the application process and helps in assessing the quality of the coating's development before it fully cures.