BaO | Bi2O3 | CaO | K2O | Li2O | MgO | Na2O | PbO | SrO | ZnO

SnO2 | TiO2 | ZrO2

CoO | Cr2O3 | CuO | Fe2O3 | FeO | MnO | Ni2O3 | V2O5

C | Cl | CO | CO2 | H2O | LOI | O | Organics | SO3 | SO4

Ag2O | AlF3 | As2O3 | As4O6 | Au2O3 | BaF2 | BeO | CaF2 | CdO | CeO2 | CrO3 | Cs2O | Cu2O | CuCO3 | Dy2O3 | Er2O3 | Eu2O3 | F | Fr2O | Free SiO2 | Ga2O3 | GdO3 | GeO2 | HfO2 | HgO | Ho2O3 | In2O3 | IrO2 | KF | KNaO | La2O3 | Lu2O3 | Mn2O3 | MnO2 | MoO3 | N2O5 | NaF | Nb2O5 | Nd2O3 | NiO | OsO2 | P2O5 | Pa2O5 | PbF2 | PdO | PmO3 | PO4 | Pr2O3 | PrO2 | PtO2 | RaO | Rb2O | Re2O7 | RhO3 | RuO2 | Sb2O3 | Sb2O5 | Sc2O3 | Se | SeO2 | Sm2O3 | Ta2O5 | Tb2O3 | Tc2O7 | ThO2 | Tl2O | Tm2O3 | U3O8 | UO2 | WO3 | Y2O3 | Yb2O3 | ZrO

SO3 (Sulfur Trioxide)

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-SO3 refers to the sulfur material that burns away during firing. It can be used in an analysis to make clear the nature of LOI components. Since it is lost during firing, a formula weight of zero should be used (if SO3 is included as an oxide in the material formula) so there is no impact on the calculated formula or calculated properties.

-Many raw clays contain some sulfur. For example, stoneware, fireclay or brick clays can contain 5% or more SO3.


By Tony Hansen



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