Biopolymers are becoming increasingly important to both industry and consumers. With regard to waste management, CO2 balance and saving petrochemical resources, increasing efforts are being made to replace standard plastics with bio-based polymers. Nowadays biopolymers can be built for example of cellulose, lactic acid, starch, lignin or bio mass. Today’s focus of research is the modification of the property profile of biopolymers to enable a substitution of petrochemical based polymers for various applications. One application that becomes more important are polymer foams due to their beneficial mechanical and insulation properties leading to light weight components, insulation elements and packaging parts. According to the necessary specific material properties (viscosity, melt strength, temperature profile and chemical structure) in foaming applications polymers have to be tailored. For biopolymers there is limited experience in material behavior and processing set-up in the field of foaming. The paper will present material properties of selected cellulose based polymers (cellulose acetate [CA], -propionate [CP], -acetate butyrate [CAB]) and corresponding processing conditions for particle foams as well as characterization of produced parts. Special focus is given to the raw material properties by analyzing thermal behavior (differential scanning calorimetry), melt strength and elongation viscosity (Rheotens test) and molecular weight distribution (gel-permeation chromatography). These results will be correlated with the foaming behavior in a continuous extrusion process with physical blowing agents and underwater pelletizer. Process set-up regarding particle foam technology, including extrusion foaming, pre-foaming and steam chest molding, will be shown. The characteristics of the resulting foam beads will be analyzed regarding bulk density, cell morphology and geometry. The molded parts will be tested on thermal conductivity as well as compression behavior.