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Fusion Frit F-524

Alternate Names: Fusion Frit F524

Description: Strontium Barium clear frit

Oxide Analysis Formula
K2O 2.60% 0.10
Na2O 2.10% 0.12
CaO 7.30% 0.47
BaO 2.00% 0.05
SrO 7.60% 0.26
Al2O3 9.50% 0.34
B2O3 12.00% 0.62
SiO2 56.90% 3.41
Oxide Weight 359.71
Formula Weight 359.71

Notes

A low fire base glaze, add 10% kaolin, adjust with other frits. Has high surface tension. Fusion recommends adding Frit FZ-24 to increase thermal expansion to deal with shivering, and frit F-15 (more color forgiving) or Frit F-69 to reduce thermal expansion to deal with crazing.

This is an approximate analysis provided Aug 2013 (but the BaO is accurate). This is likely an equivalent to Ferro Frit FB-276-P (they supply a very similar approximate analysis).

Rather than for a specific type of glaze, this frit is best viewed as a fritted source of strontium (better than dealing with the issues of using pure strontium carbonate) This frit is used in the excellent MK3330 cone 6 crystal clear dinnerware glaze.

Related Information

Fusion Frit 524 melt behavior 1600-1850F


High and low surface tension Frits


Fired at 1850F. Frit F-524 has run off the tester since 1850F. Frit 3602 is lead bisilicate.

1700F Frit Melt-Off: Who is the winner? Not the lead bisilicate!


Melted balls of 15 frits on a ceramic tile

These were 10g balls melted using our GBMF test. Frit 3602 is lead bisilicate. But it got "smoked" by the Fusion FZ-16 high-zinc, high-boron zero-alumina! Maybe you always thought lead was the best melter. That it produced the most transparent, crystal-clear glass. But that is not what we see here. That being said, notice the lead is not crazing but the FZ-16 is crazing badly, that is a problem for many applications. Notice something else: Each frit has a distinctive melt fingerprint that makes it recognizable in tests like this.

Melt fluidity comparison - 1750F


Fired at 350F/hr to 1750F and held for 15 minutes. Frit 3110 has taken off. And F75, 3195 and 3134 (the latter two having big differences in surface tension).

Various frits fired at 1950F


These sixteen GBMF test balls have melted down onto a slab of grogged clay. Kiln fired at 108F/hr for the last 100 degrees F and held for 15 minutes. This demonstrates the comparison value of this test and how various frits compare in their melting character.

Frits fired to 2050F


These are higher temperature frits. 10 gram balls were melted on to this tile.

Various frits fired at 1850F


16 GBMF tests on a slab of grogged clay. Kiln fired at 108F/hr for last 100 degrees F and held for 15 minutes.

Frit melt fluidity comparison - 1300F


Fired at 350F/hr to 1300F and held for 15 minutes. Some are still burning off carbon (which seems strange). There are two early leaders: Ferro frit 3110 and Fusion frit F75 are starting to deform (they have almost the same chemistry). Amazingly, these two frits have low boron, they rely on high soda as the flux.

Melt fluidity comparison of frits - 1350F


Fired at 350F/hr to 1350F and held for 15 minutes. Some are still burning off carbon (which seems strange). The two FZ16s are starting to move. Frit 3134 is expanding. 3602 is also starting to melt.

Melt fluidity comparison of frits - 1400F


Fired at 350F/hr to 1400F and held for 15 minutes. Frit 3134 is still expanding. 3602 is also starting to flow. A number of them are shrinking and densifying like a porcelain would.

Frit Melt Fluidity Comparison - 1800F


Fired at 350F/hr to 1800F and held for 15 minutes (I already did firings from 1300F-1750F in 50 degree increments, all of them are visible in the parent project). Frit 3110, 3134, 3195, F75 have run all the way down. All of the frits have softened and melted slowly over a range of temperatures (hundreds of degrees). By contrast, Gerstley Borate, the only raw material here, suddenly melted and flowed right over the cliff (between 1600 and1650)! But not before Frit 3602 and FZ16 had done so earlier. Frit 3249 is just starting to soften but F69 (the Fusion Frits equivalent) is a little ahead of it. LA300 and Frit 3124 are starting also. F524, F38, F15 will all be over the end by the next firing. The melt surface tension is evident by the way in which the melts spread out or hold together.

Melt fluidity comparison of frits - 1450F


Fired at 350F/hr to 1450F and held for 15 minutes. Frit 3134 is still expanding. 3602 is blasting out of the gate, taking the lead. F75 is starting to flow.

Melt fluidity comparison of frits - 1500F


Fired at 350F/hr to 1500F and held for 15 minutes. Frit 3134 is still expanding. 3602 and FZ16 are really starting to move. 3195, F38 and F15 are softening.

Melt fluidity comparison of frits - 1550F


Fired at 350F/hr to 1550F and held for 15 minutes. Frit 3134 is still expanding. 3602 and FZ16 are going to be off-ramp by next firing.

Melt fluidity comparison of frits - 1650F


Fired at 350F/hr to 1650F and held for 15 minutes. FZ16 has turned crystal clear and spread out across the runway (has low surface tension). Frit 3110 has so much surface tension that the flow can be lifted off the tester. Since 1600F Gerstley Borate has gone from unmelted to passing all the rest!

Melt fluidity comparison of frits - 1700F


Fired at 350F/hr to 1700F and held for 15 minutes. 3110 is finally starting to move. 3134 also (being full of bubbles). Gerstley Borate has turned almost transparent (because the Colemanite portion of it is now melting). 3195 is looking very well behaved compared to most others, forming a bubble free glass of high surface tension (F15 and F524 are starting to do the same).

Frit Melt Fluidity Comparison - 1850F


Frits melting side-by-side at 1850F

These melt flow tests were fired at 350F/hr to 1850F and held for 15 minutes (I did firings at 50-degree increments across a wide range). It is amazing how active some frits are, even well below normal bisque temperatures! Frit 3110, Frit 3134, Frit 3195, Frit F-75 have all flowed all the way down for many previous temperatures. LA300 and Frit 3124 were just starting at 1800F, look at them now! Frit F-524 and Frit F-38 have gone from half-way at 1800F to water-falling over the end. Frit 3249 is still not out-of-the-gate but Frit F-69 (the Fusion Frits equivalent of 3249) is half-way. Note how the melt surface tension is evident by the way in which the melts spread out or hold together. By contrast, Gerstley Borate (labelled "GB"), the only raw material here, suddenly melted and flowed right over-the-cliff between 1600 and 1650! The best melter of all of them is high-boron high-zinc Frit FZ-16.

Links

Materials Fusion Frit FZ-24
Materials Fusion Frit F-15
Materials Fusion Frit F-69
A magnesia borosilicate frit having very low thermal expansion and melting point. Commonly used as a substitute for Ferro frit 3249.
Materials Pemco Frit P-609
Materials Ferro Frit FB-276-P
Materials Ferro Frit CC-274
URLs http://www.fusionceramics.com/
Fusion Ceramics Frit Website
Typecodes Frit
A frit is the powdered form a man-made glass. Frits are premelted, then ground to a glass. They have tightly controlled chemistries, they are available for glazes of all types.
Recipes G2916F - Cone 6 Stoneware/Whiteware transparent glaze
Crystal clear industrial dinnerware glaze

Data

Co-efficient of Linear Expansion 5.17 x 10-6
Frit Softening Point 1800F
By Tony Hansen
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