The firing of enamel products is a very important part of the enamel process. During the firing process, the various firing technical parameters and operating

An enamel product has to go through hundreds of processes from the manufacture of the metal body to the melting of the enamel frit to the completion.

When the enamel frit and the metal body are fired, gas will be generated. The gas that is not completely discharged forms "bubbles"

After the enamel product is fired, the cracks that appear in the porcelain layer are called cracks.

Steel may absorb hydrogen during melting, or during the various steps of applying enamel frit (dipping, drying and firing),

The previous article introduced the various defects of enamel products and their causes, including bubbles, scorching, peeling, copper heads (copper spots), tearing and bursting, but these defects are only part of them.

The phenomenon, causes and solutions of many defects in steel enamel are also applicable to cast iron enamel. The following are the peculiar defects of cast iron enamel and their causes and solutions.

After the enamel product is fired, the cracks in the porcelain layer are called cracks; although the cracks in the porcelain layer are fused during firing, the traces still left are called lines. Lines often appear on the bottom and body of the vessel. Other defects that form textures are also classified here.

Porcelain enamel chipping of enamel products means that the porcelain layer is peeled off from the product in pieces, and some of the ground coat is exposed after the peeling off, and some of the metal surface of the green body is exposed.