This International Standard describes a method for chemical analysis of refractory products and materials and technical ceramics, composed of oxides, and comprises the determination of oxide at levels between 0,01% and 99% content by the XRF fused cast bead method. Note: Constituents at concentrations greater than 99% (on the dried basis) should be reported on by difference, providing all likely minor constituents and the loss on ignition have been determined. These figures should also be checked by direct determinations.