[Enamel Manufacturers Must-See] Types of Enamel Cover Coat
The cover coat is divided into titanium cover coat, antimony cover coat, colored titanium cover coat, color ground coat cover coat, black cover coat, matte cover coat and so on.
Titanium cover coat, coloring ability, that is, strong hiding power. The thickness of the porcelain layer is generally between 0.12–0.2 to have better hiding power. The whiteness value is above 85; the glossiness is above 95, and some can reach about 120 degrees. The porcelain surface is delicate and smooth. The hue components of the titanium cover coat are blue light white phase and tooth white phase. Titanium cover coat porcelain layer over 0.25 is easy to take off the porcelain; especially the R angle part, easy to crack, line, and shrinkage. In case of organic impurities, boiling point and spot defects appear.
The color titanium cover coat is uniform and pure in color and luster. Such as milk yellow, ivory, titanium pink, titanium gray, titanium light lake, titanium fruit green and so on. But in the firing process, the firing temperature should be controlled, and the temperature will cause the color depth. There is also a certain color difference between the primary and secondary enamels. Other defects are the same as titanium white enamel. The poor hiding power of the antimony cover coat requires secondary enamelling, and the antimony content exceeds the standard, which has been eliminated.
ground coat
The ground coat is generally mixed with pigments to obtain the desired color for spraying. It is now generally used for cover coats of various colors. Due to the limited variety of colored titanium cover coats, which do not meet the production requirements of dozens or even tens of thousands of colors, the ground coat is adjusted with various pigments to meet our needs. The ground coat is required to be transparent or translucent, and cannot affect the color development and discoloration of the pigment. The porcelain surface is fine and smooth, and the general gloss is about 110 degrees. The ground coat is not resistant to firing, which is 30°C lower than that of the titanium cover coat. Defects such as bad hue, reduced luster, and poor porcelain surface.
jack@nolifrit.com