Hybridraketer har inte sett så mycket användning som dess motsvarigheter som använder flytande eller fasta drivmedel. De främsta orsakerna kan förklaras med att hybridraketer historiskt sett haft lägre regressionshastighet och bränsletäthet. Inverkan av nackdelarna har dock minskat tack vare fortsatt forskning rörande hybridraketer. Tillsammans med de säkerhetsoch ekonomiska fördelar som kommer med hybridraketer har gjort hybridraketer ett mer konkurrenskraftiga. Hexaminbaserade fasta bränslen har formulerats och utvärderats med betoning att förbättra härdningstid och mekaniska egenskaper. Genom att inkludera mjukgörare och ändra NCO/OH-förhållandet har ett fast bränsle med lovande mekaniska egenskaperoch god härdningstid framställts. / Hybrid propellant rockets has not seen as much use as its liquid and solid propellant counterparts. The main reasons for this can be attributed to hybrid propellant rockets historically having lower regression rate and fuel density. However, the impact of these disadvantages have been diminished over the years as a result of increased research. This together with the safety and economic advantages of hybrid propellant rockets, the hybrid system have become a more competitive system to use. Hexamine basedsolid fuel grains have been formulated and evaluated with emphasis on enhancing pot-life and tensile proprieties. By including plasticisers and altering the NCO/OH ratio, a solid fuel grain was successfully produced, overcoming earlier encountered problems with short pot-life as well as having promising tensile properties.