... bigest producer in China. CAS No.: 10294-54-9 [Formula] Cs2SO4 [Appearance] White crystal, easy to soluble in water, insoluble in ... alcohol and acetone. M.P. 1010°C [Standard of Quality] Cs2SO4 min%Impurities Max%LiNaKRbCaMgFeAlSiO2Heavy Metal (as Pb)99.00.0010 ...