Ferro Frit 3124

Source: http://ctmpotterssupplies.co.uk/ceramicmaterialsglossary.html

1000-1150oC 7.9 Expansion SiO2 55.3%, Al2O3 9.9%, B2O3 13.7%, K2O 0.7%, Na2O3 6.3%, CaO 14.1% Often added to glazes to make them melt at lower temperatures - it is a quite balanced glaze frit, increasing the boron content without overly disrupting the balance of other oxides.