Alkaline frit glass is usually chosen when the glaze needs to melt earlier and flow better.

Its high alkali content helps lower the firing temperature and gives the glaze a clearer, smoother fired surface.If your glaze is hard to melt at 850–1050°C, or the surface looks dull and tight after firing, this frit is worth testing first.

This type of frit is widely applied in transparent and functional glazes where strong melting behavior and stable glaze-body interaction are required.

Technical Performance and Advantages

Strong Fluxing Action at Lower Firing Temperatures

GlazePeak alkaline frit glass is formulated to perform efficiently within a firing temperature range of 850–1050°C, making it suitable for low- and medium-temperature ceramic processes.

Boron oxide and sodium oxide frit
Item	Product Code	Soften Temperture(°C)	Firng Temperture(°C)	Coefficient Of Expansion (*10-7/°C)	Firing times	Appearance
1	GP-601#	600-650	900-1000	280	One and two times	Granular, powder
2	GP-602#	620-650	950-1050	300	One and two times	Granular
3	GP-603#	580-620	850-950	370	One and two times	Granular
4	GP-313#	550-650	700-850	420	One and two times	Granular, powder
5	GP-316#	650-680	950-1000	400	One and two times	Granular
6	GP-5519#	700-800	1100-1150	390	One and two times	Granular
7	GP-598#	680-720	950-1050	380	One and two times	Granular, powder

Why this matters:

Promotes early melting and rapid glass phase formation

Reduces overall firing temperature requirements

Supports energy-efficient kiln operation

As a sodium oxide frit, its strong alkali fluxing capability ensures complete glaze melting even under fast firing conditions, contributing to smoother surfaces and reduced unmelted defects.

Please refer to the images below showing the after-burning effect.

High Thermal Expansion for Glaze Compatibility and Adhesion

With a controlled thermal expansion coefficient of 200–300 ×10⁻⁷/°C, this alkaline frit is particularly effective when paired with bodies requiring higher expansion glazes.

Engineering benefits include:

Improved glaze-body bonding and interface stability

Reduced risk of glaze crawling or poor adhesion

Enhanced performance as an alkaline frit for adhesion promotion

This expansion range allows the glaze to better accommodate body movement during cooling, improving production reliability.

In a glaze formula, this usually helps with:

Smoother surface leveling

better transparency in clear or light-colored glaze

stronger melt development at lower firing temperature

less stiffness in the fired glaze surface

In transparent and lightly opacified systems, it also supports consistent dispersion of additives, contributing to more predictable glaze appearance.

How We Check This Frit Before Shipment

For this alkaline frit, we mainly check one thing: whether it behaves the same from batch to batch.

We test the chemistry, particle size, melting response, and fired glaze surface. If the melt is not close to the approved sample, the batch needs review before shipment.

This matters because alkaline frit glass is used for fluxing. A small change in melting behavior can affect glaze flow, transparency, and final surface quality.

Typical Applications

Transparent and high-gloss ceramic glazes

Low- and medium-temperature glaze systems

Functional glazes requiring strong adhesion

Glaze formulations requiring improved flowability and hardness

Why Choose GlazePeak Alkaline Frit Glass

Effective fluxing performance at 850–1050°C

High alkali composition for improved glaze melting

Controlled expansion for reliable adhesion

Enhanced transparency and surface smoothness

Technical support for formulation and process optimization

FAQ

Q: Will this alkaline frit make my glaze melt faster?

A: Yes, that is usually why people test it first. If your glaze feels "tight" at 850–1050°C, alkaline frit glass can help it open earlier and flow better.

Q: Can I use it in fast firing?

A: You can test it for fast firing, especially when the glaze needs quick melt development.But don't judge it only on speed. Check the fired surface too - flow, clarity, and glaze fit all matter.

Q: Will high expansion cause trouble?

A: It depends on your body.A higher expansion frit can help adhesion in some glaze systems, but if the match is wrong, it may bring new stress problems. So we always suggest checking it with your own body and firing curve.

Q: Can you adjust the frit for my glaze?

A: Yes.Send us your firing temperature, body type, and the surface you want. If your glaze is too stiff, too cloudy, or not melting cleanly, we can help you see whether this alkaline frit is the right starting point.