These standards are classified as "infinite" or "saturation" thickness, meaning they exceed the measurable range for XRF. Some standards in this category (see "Alloy" sub-category) are used for quantitative alloy elemental composition calibration. In other cases, they are used for calibration normalization and spectrum profiling, supporting both calibration and deconvolution software.

Electron beam XRF users should consult with Calmeasures before purchasing the "Alloy" type standards intended for quantitative composition analysis.