For obtaining small parts with complex shape, for which a finishing operation cannot be applied easily, injection forming can be used. For a successful applying of this procedure not only the conditions of the injection process deployment must be taken into consideration, but also the conditions of the binder removal. These conditions impose, in a big measure, the feedstock characteristics, especially the ones of the binder used. The characteristics of the binder mixed with powder influence the injection process, the debinding process and the quality of the injected and sintered parts. Regarding that the binders used are formed from many components, it is very important to know the measure that each of them determines the rheological characteristics of the mixture. In the research made, a binder was used formed from polyethylene, paraffin and stearic acid, a binder which is often used to obtain mixtures for injection. It was watched how these components influence the binder characteristics, the injection process deployment and the effect they have on the quality of the debinded parts.