Light Glaze Defect in Ceramics: Causes & Analysis

Light Glaze Defect in Ceramics: Causes & Analysis

Overview

Light glaze defect occurs when parts or the entire surface of a ware have insufficient glaze thickness. This issue affects the appearance of the product. The defect is primarily caused by problems during the glazing process, but firing conditions can also contribute.

Common Causes

Insufficient Glaze Application

One common cause of light glaze is insufficient glaze application during spraying. This can happen for several reasons, such as:

• Operator's lack of skill

• Inadequate glaze flow

• Blockages in the spray gun

When the glaze is not applied evenly or in the required thickness, certain areas of the ware remain under-glazed, leading to the defect.

Over-Firing in the Kiln

Light glaze can also result from over-firing in the kiln. Excessive firing temperatures can cause the glaze to melt and run off the surface, leaving behind thin glaze.