Ferro Frit 3249
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- SiO₂ 42.1%, Al₂O₃ 13.3%, B₂O₃ 28.9%, CaO 3.5%, MgO 12.2%
- Also called
- Frit 3249-2, F3249, Vibrantz Frit 3249
- Made by
- Vibrantz Technologies (formerly Ferro Corporation)
- Sold in
- US
- Similar materials
- Fusion Frit F-69
- Source
- Digitalfire Reference Library: Ferro Frit 3249
Alkali-free magnesia borosilicate frit with very low thermal expansion (CTE about 4.0); used at 3-10% to cure crazing and as a low-melting MgO source. Fusion 1900 F, flow 2300 F (Ferro 2003).
Oxide analysis and unity formula
Glazecalc has the analysis of Ferro Frit 3249 as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Ferro Frit 3249 that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 42.1 | 1.919 |
| Al₂O₃ | 13.3 | 0.357 |
| B₂O₃ | 28.9 | 1.137 |
| CaO | 3.5 | 0.171 |
| MgO | 12.2 | 0.829 |
- Equivalent weight
- 273.89
- Fired weight
- 273.89
- Loss on ignition
- 0%
The equivalent weight is the grams of Ferro Frit 3249 that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Non-hazardous glass powder per supplier SDS; avoid breathing dust.
Use it in a recipe
Add Ferro Frit 3249 to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.