Can enamel RTU powder still be used if it gets damp and clumps up during storage?

RTU enamel powder is a powdered enamel material, which is easily affected by the storage environment. Once it gets damp, the powder is prone to absorbing moisture and clumping. Its usability needs to be judged based on the degree of clumping. Slightly clumped powder can be used normally after scientific re-grinding. However, it is not recommended to use powder that is severely clumped and accompanied by deterioration, so as to avoid affecting the quality of the finished enamel product.

Proper storage is the key to keeping RTU enamel powder dry and free from clumping. It should be kept in a dry, well-ventilated environment; complete absence of moisture is not required, but a relatively dry condition should be maintained. After opening the packaging bag, any unused powder should be resealed promptly by tightly closing the bag opening to prevent moisture from the air from entering. Based on practical experience, if stored properly in a dry environment, RTU powder can maintain good performance for over a year without affecting subsequent use.

If the RTU powder has become damp and clumped, it can be salvaged by re-milling. During re-milling, an appropriate amount of clay and sodium nitrite should be added to adjust the powder’s suspension and retention properties, ensuring that it disperses evenly during the subsequent enamel glaze application. Alternatively, damp RTU powder can be mixed with dry RTU powder in a suitable ratio. After thorough mixing, the powder should be re-sieved to restore its loose state and performance.

It is important to note that re-milling remediation is only suitable for mild to moderate clumping. If the clumps are hard, accompanied by mold, or show obvious performance issues, the powder should be discarded. This prevents enamel defects such as pinholes or peeling caused by poor powder performance, ensuring production stability.