Zirconium Silicate Frit Glaze

In white glaze production, simply adding more zircon is not always the best answer.

Sometimes the glaze looks white enough at first, but the surface feels slightly rough after firing. In other cases, more zircon is added, yet the result does not improve as expected.The problem is usually not zircon itself. It is how zircon is distributed inside the glaze after firing.

This is where zirconium silicate frit glaze starts to show its value.

In GlazePeak 11#, zirconium is already melted into the frit structure. This changes how the glaze actually behaves in the kiln.Instead of depending entirely on raw zircon dispersion in the mill, the frit helps create a more even white phase after melting. The glaze looks cleaner, and the result is easier to repeat from batch to batch.

For sanitary ware and tableware, that kind of repeatability matters more than a theoretical opacity number on paper.

The performance here is not driven by one oxide alone. It is the overall balance that makes the difference.

 

The frit contains 11.41% Zr(Hf)O₂, which is the main source of whiteness and covering effect. At the same time, 58.08% SiO₂ provides the backbone of the glass phase, while 10.92% B2O3 helps the frit melt within the 1000–1150°C range without becoming too stiff.

 

That balance is what keeps the glaze from becoming either too stiff or too unstable.If zircon is high but the glass phase is not well supported, the glaze can turn dense or uneven. If the melt is too soft, whiteness may look unstable. Here, silica, boron, calcium, and alumina work together to keep the glaze surface both white and controlled.

 

This is why the frit performs well not only in appearance, but also in production handling.

This product contains only a limited amount of zinc oxide. In practice, that means its whitening effect does not rely heavily on zinc-assisted visual adjustment.

The main opacifying role still comes from the zircon system itself.

That is why 11# can be described as a low-zinc zirconium silicate frit. For customers who want a more zircon-centered white glaze structure, this is often a cleaner and more predictable route.

It also helps separate this product from high-zinc systems that are designed more for surface feel, gloss transition, or special decorative effects.

This frit is mainly used in:

• Sanitary ware white glazes
• Daily-use porcelain and tableware
• White decorative ceramic surfaces
• Some once-fire tile glaze systems within the suitable firing window

In sanitary ware, whiteness alone is not enough. The glaze surface also needs to stay dense and clean after firing.

For tableware, customers usually care about the same thing in a different way: the glaze should look bright, even, and dependable across repeated production.

That is exactly where this kind of high zirconia frit becomes valuable.

In practice, this frit is often chosen when:

• You want stable whiteness without depending too much on raw zircon addition
• You need a white glaze that can be repeated more consistently in production
• You want a lead-free zircon frit for sanitary ware or porcelain applications
• You are looking for a practical zircon substitute frit approach inside the glaze recipe, especially where full raw zircon loading becomes costly or difficult to control

It may still need further glaze adjustment when:

Extremely high covering is required on very dark bodies

The glaze system is heavily influenced by other opacifiers or strong colorants

Before 11# leaves our factory, we do not just look at oxide percentages.

We also pay attention to how the frit behaves after melting. Thermal response, melt development, and composition stability are all checked under controlled conditions. If the batch does not behave the way it should, it does not move forward.

Because in real production, whiteness is not decided on paper. It only shows after firing.

Build a More Reliable White Glaze System

If your glaze needs to look right not only in formula, but also after firing, zirconium silicate frit glaze 11# offers a more stable route. It combines whiteness, lead-free safety, and repeatable firing behavior in one frit structure.

Zibo GlazePeak can provide sample evaluation and formulation support based on your firing range, glaze system, and product application.

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