For enamel manufacturers, in addition to the quality of the steel plate (cast iron), the choice of enamel is also very important if they want to make high-quality enamel products. The quality of enamel is generally judged from the following criteria: adhesion, acid resistance, salt spray resistance, etc. If it is a cover coat, it also has opacity. When enamel manufacturers choose enamel frits, in addition to checking whether the final fired porcelain surface has defects such as pinholes, focal points, dens, and scale explosions, they must also consider whether the requirements for adhesion and acid resistance meet the standards.

As a manufacturer of enamel frits, Nolifrit will test the quality of the enamels every time it develops a new enamel, and will test the moisture, acid resistance, and adhesion of the enamel step by step. The cover coat will test the effect of the porcelain surface and add pigments. Whether there will be color cast in the end, etc., and whether the special performance of the special enamel (acid-resistant enamel, anti-explosion enamel, salt spray resistance, etc.) meets the standard.

So as an enamel manufacturer, if there is no professional enamel testing equipment, how to judge the quality of enamel? There are several ways to do this:

Measuring moisture: Weigh the enamel with a net weight of 100, record the gross weight before drying and after drying, and measure the moisture (moisture content).

Adhesion strength: The adhesion strength of enamel is judged according to the degree of metal exposed on the ground coat layer after the enamel surface is impacted. It is generally divided into silk, mesh and light board (the silk is the best, and the light board is the worst).

Acid resistance: According to the acid resistance test of citric acid, the acid resistance of enamel can be divided into A+ (AA), A and B grades.

Salt spray resistance performance: Generally, a salt spray test instrument is used. Put the hob or other test samples to be tested into the salt spray test machine, and wait for 48 hours (or 72 hours or even longer) to see if there is any rust.

Nolifrit is a supplier of enamel frits and inorganic pigments, providing customers with one-stop service, if you have any questions, please contact us!