Some glazes are too transparent.Some are too flat and opaque.Semi-opaque frit sits between these two directions.
It lets part of the light pass through, but still gives the surface a soft covered feeling. That is why many factories use it as a semi-opaque base frit for tableware, decorative ceramics, interior wall tiles, and layered glaze designs.
For GP-6612#, the firing range is clear: 1080–1130°C.This makes it suitable for medium-temperature glaze systems where the glaze needs to melt well but should not run too much.
The COE is around 165–180 ×10⁻⁷/°C.This gives you a starting point for matching common ceramic bodies. It does not mean you can skip testing, but it helps reduce the risk of poor glaze fit when the formula is adjusted properly.
If your target is a translucent frit effect, a soft eggshell glaze surface, or a frit for gradient glaze effects, GP-6612# is worth testing before moving to a fully opaque system.
|
Item |
Product Code |
Softening Temperature |
Firing Temperature |
COE ×10⁻⁷/°C |
Firing Type |
Appearance |
|
1 |
GP-6612# |
750–780°C |
1080–1130°C |
165 |
One and two times |
Granular/ powder |
Start with firing temperature first. If your kiln works around 1080–1130°C, then check the COE and fired surface. For this frit, the main value is not strong coverage. It is the soft balance between translucency, surface depth, and glaze stability.
Where Do all customers actually Use GP-6612#?
When transparent glaze looks too thin.Sometimes a transparent glaze makes the body look too direct.The surface has gloss, but not enough softness.
GP-6612# can be used when you want the glaze to keep some light transmission, but with a warmer and more covered visual effect.
This is why it works well in tableware and household ceramics where the surface needs to look clean, but not plain.
When opaque glaze feels too heavy
Fully opaque glaze can cover well, but it may look flat.
If the customer wants a softer white tone, a semi-covered surface, or an eggshell glaze effect, semi-opaque frit gives more room to adjust.
It helps the glaze look lighter than opaque frit, but more refined than a simple transparent glaze.
When you are making gradient or layered glaze
Gradient glaze is easy to make on a sample tile.
It is harder to keep stable in production.
GP-6612# can be tested as a base frit when the glaze needs a smooth transition between transparent, semi-opaque, and matte layers.
The goal is not a sharp color block.The goal is a soft transition.
Why Consider Semi-Opaque Frit as an Upgrade?
More surface depth than transparent frit
Transparent frit gives clarity.Semi-opaque frit gives depth.If the product needs a softer visual effect, GP-6612# may be a better starting point.
Less flat than fully opaque frit
Opaque frit can sometimes make the surface too solid.
Semi-opaque frit keeps part of the transparency, so the fired glaze looks lighter and more natural.
Useful for eggshell and soft translucent glaze
For eggshell glaze, the surface should feel gentle, not harsh.GP-6612# helps create that soft semi-covered look when the glaze formula and firing curve are matched well.
A practical choice for medium-temperature firing
The 1080–1130°C range fits many tableware, decorative ceramic, and architectural glaze systems.
If your kiln is already in this range, you do not need to rebuild the whole glaze direction first. Start with a small test and check surface softness, opacity level, and glaze fit.
How We Check GP-6612# Before Shipment
For semi-opaque frit, we mainly care about the fired surface.
Does it melt cleanly?
Does the surface stay soft and even?
Does the opacity look stable after firing?
We check the chemistry, particle size, melting response, and fired glaze result. If the frit gives a different surface from the approved sample, the batch needs review before shipment.
FAQ
Q: Is semi-opaque frit the same as opaque frit?
A: No.
Opaque frit blocks more light.
Semi-opaque frit still lets some light through, so the surface looks softer and less flat.
Q: Can GP-6612# be used for eggshell glaze?
A: Yes, it can be tested for eggshell glaze or soft translucent glaze.
The final result still depends on glaze thickness, body color, firing curve, and the rest of the formula.
Q: Can it be used for gradient glaze effects?
A: Yes.
If you want a smooth transition instead of a hard boundary, GP-6612# can work as a semi-opaque base frit in layered glaze systems.
Q: What should I test first?
A: Start with your firing temperature and body type.
Then check fired opacity, surface softness, glaze flow, and COE fit. Do not judge it only by the unfired glaze slip.
Q: Thinking About a Softer Semi-Opaque Glaze?
A: Send us your firing temperature, body type, and the surface you want.
Soft white?
Eggshell glaze?
Gradient glaze?
A translucent but not fully clear surface?
We can help you decide whether GP-6612# is a good starting frit for testing.
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