Why Does Iron Oxide Red Color the Bricks Unevenly？

Due to its own characteristics, iron oxide red is often used for all kinds of brick coloring and wall painting. However, users who often come into contact with it will find a phenomenon, that is, uneven coloring, which will affect the appearance and use of the product. What should we do if this happens?

Iron oxide red is used for coloring road bricks, and its color depends on the density of pigment in cement slurry, the accuracy of cement measurement and the stability of pigment chroma. Therefore, we can draw the conclusion that when pigments are used to color road bricks, the causes of color difference are uneven feeding, inaccurate mix ratio, unreasonable maintenance system, and large mud content of sand and stone.

⚡ Solution:

✔ 1. To strengthen the quality control of raw materials, especially the control of sand and stone mud content. Through the comparison of practice, the appropriate concrete proportion is selected, and the mixing time and vibrating time of raw materials are prolonged as far as possible under the condition of satisfying the gradation of sand and stone and the workability of concrete.

✔ 2. Regularly maintain kerb stone machine equipment, calibrate measuring equipment, reduce measuring error, and make the measuring standard of pigment and cement close to a stable state.

✔ 3. Different batches of iron oxide red pigment will have different pigment colors. It is necessary to choose appropriate pigments according to the requirements of building bricks, so that the quality is stable and the color difference is small under the premise of ensuring the consistency of color.