Modern solid propellants emerged in the early 1940s with the invention of composite propellants, and today have great progress and permanent development. The processing technique with two-roll milling showed that grains production is possible from propellant compositions based on the TPE binder system, which contains higher solids levels. Propellant compositions using this binder system can accept up to 90% filler, depending on the type of process used. This composition blends with a combination of customized propellant cross-section geometry and exposed burning surface, allowing the possibility of designing different types of rocket motors. Modular grain technology applies from small to very large calibres (higher than 500 mm). From early beginning company EDePro improving own developing technology and today is one of the biggest and most reliable producers in this part of Europe.