The required period for the complete gasification of the wood char is about 9 min, compared to plastic 15 min. The char structure strongly influences the process kinetics. The products based on plastic require a residence time with about 66% longer than the cellulose based products. For the mixtures, the residence time is imposed by the product with the slowest kinetic. The factors that mainly influence the reactions speed are multiples and rather difficult to quantify. Among them we mention the porosity and specific surface. To clearly indicate the influence of these characteristics a detailed study is necessary that does not make the object of the present work.