Enamel boiling refers to the accumulation of bubbles, pinholes, black spots, focal points, etc. on the surface of the cover coat layer due to excessive boiling of the

Many enamel factories found focal points or pitting on the porcelain surface after firing the ground coat of the enamel products, which seriously affected the quality

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.