Choosing a ceramic glaze goes far beyond an aesthetic decision. In the ceramics industry, it is a technical decision that determines the technical performance of the piece, its strength, its stability during production, and the final perception of value.
It is not just a matter of defining the gloss, color, or texture, but of ensuring variables such as compatibility with the substrate, firing temperature, application method, reproducibility, compliance with regulations, production line performance, and design objectives.
For a plant manager, the real challenge lies not in achieving a good result in the lab, but in maintaining that consistency batch after batch. A poorly formulated glaze can cause surface defects, color variations, adhesion issues, lack of flatness, incompatibilities with digital decorations, or discrepancies between the prototype and the final product.
That is why selecting the right glaze is not just about choosing a finish. It is making a technical decision that affects the quality, cost, efficiency, and final value of the product. At Kerafrit, we develop industrial ceramic glazes specifically designed to meet this dual requirement: technical performance and aesthetic value.
At Kerafrit, we know that the success of a well-finished surface doesn’t begin on the surface itself, but long before that—through precise formulation and ongoing technical support throughout the production process. That’s why we develop industrial ceramic glazes specifically designed to meet this dual requirement, combining technical performance with aesthetic value.
In this article, you will learn:
What technical criteria to consider before choosing a glaze for industrial production.
How glazes are classified according to the most common types of industrial firing.
The importance of a glaze’s rheological properties and how they interact with digital and traditional decoration technologies.
How a well-tuned formulation helps improve reproducibility, durability, and the final appearance of the surface.
Key criteria for selecting industrial glazes
There is no such thing as a universal glaze. There is, however, a glaze that is suitable for a specific substrate, process, application, and design intent.
To make an informed choice, it is important to evaluate several factors that should guide the selection and technical development in the production facility:
1. Thermomechanical compatibility with the substrate and slip
The integrity of a ceramic piece depends on the physical and dilatometric coupling between its layers. The structural behavior of ceramic materials is characterized by excellent resistance to compressive forces but extreme brittleness under tensile stress.
Therefore, when evaluating a dental enamel, stress control through precise adjustment of the Coefficient of Thermal Expansion (CTE) ensures that the surface remains under slight compression after cooling. Any deviation in this coupling triggers specific defects depending on the direction of the mismatch:
Compression deficit: if the glaze shrinks more than the substrate, it is subjected to tensile forces that fracture the glass, causing cracking.
Excessive compression: if the enamel’s contraction is much less than that of the substrate, the accumulated stresses push the glass layer outward, causing chipping. In large-format products, this excess force compromises the piece’s geometry, leading to flatness distortions (concave or convex curvatures).
In this system, the slip acts as an intermediate layer that not only optimizes adhesion and regulates absorption during the firing cycle, but also waterproofs the substrate and neutralizes color variations in the base clay, ensuring consistent and predictable performance of the entire piece.
