Typical mold powder compositions(wt%) are given as

SiO2=33, CaO=20, MgO=1.5, Al2O3=6.0, Na2O=10.5, K2O=1.5, Fe2O3=2.5, MnO=0.1, Cfree=20.5, CO2=6.5, Ctotal=22.0, F=5.0.

For estimating CaF2 wt% in mold powder, should I calculate stoichiometric CaF2 based on F wt% present in mold powder.

If yes, than CaO wt% have to reduce to compensate Ca present in CaF2.

In that case, basicity of mold powder also decreases since CaO wt% will reduce.