With regard to European standardization, a technical specification (DIN CEN/TS 15534, parts 1–3, August 2007) has been published [3–5]. Additionally, several European WPC producers have created a quality seal for decking based on WPC in which product requirements were defined. So far, rapid analytical methods for the quantification of the mass percentages of wood flour and polymer in WPC for production quality control and for compositional analysis of samples with unknown formulation are missing. Up to now, several methods for compositional analysis were tested, for example, extraction in solvents using a Soxhlet apparatus, tagging of components, solid state NMR or FTIR spectroscopy [2].