Vibrantz Frit 90328
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- SiO₂ 65.51%, Al₂O₃ 7.88%, B₂O₃ 21.5%, CaO 0.24%, MgO 0.35%, Na₂O 4.52%
- Also called
- Ferro Fritte 90328, Degussa Fritte 90328, 90328 Fritte transparent (F) Na-B-Silikat
- Made by
- Vibrantz GmbH, Frankfurt am Main, Germany (formerly Ferro GmbH; the 90xxx numbers date from Degussa)
- Sold in
- EU
- Similar materials
- Low Expansion Frit (Potclays 2279)
- Source
- Hans Wolbring, product page 'Fritte transparent (F) BF' (art. 90328, Ferro), Seger formula; Internet Archive copy of 2021, the same in Wolbring's 2000 frit list
A low-expansion sodium borosilicate frit: high in silica and boron, with little alkali. Low-expansion frits like this one are added to glazes to lower their thermal expansion and cure crazing. On its own it melts only at high temperature (half-sphere point 1270 °C). Expansion is 48 x 10^-7/K. Sold by Hans Wolbring and keramikbedarf-online.de.
Oxide analysis and unity formula
Glazecalc has the analysis of Vibrantz Frit 90328 as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Vibrantz Frit 90328 that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 65.51 | 12.694 |
| Al₂O₃ | 7.88 | 0.900 |
| B₂O₃ | 21.5 | 3.596 |
| CaO | 0.24 | 0.050 |
| MgO | 0.35 | 0.101 |
| Na₂O | 4.52 | 0.849 |
- Equivalent weight
- 1164.26
- Fired weight
- 1164.26
- Loss on ignition
- 0%
The equivalent weight is the grams of Vibrantz Frit 90328 that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Leadless frit (glass, CAS 65997-18-4) with a lot of boron. No SDS was found for this product. Some EU suppliers label boron-rich frits as toxic to reproduction (H360FD), so check the SDS that comes with the bag. Avoid breathing the dust.
Use it in a recipe
Add Vibrantz Frit 90328 to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.