A halogen-free flame-retardant polypropylene compound was developed and characterized to be suitable for the production of ventilation pipes. 4 types each of polypropylene (PP)- and magnesium hydroxide (MH) types were examined in their suitability for producing a compound that is classified as V0 in a UL 94 burning test. Using one selected PP and MH type, the influence of other mineral additives or a crosslinker on viscosity, flame resistance, mechanical properties and colour was examined. First, small quantities below 1 kg were produced on a kneader, plates were pressed and examined. The composition formulas were characterized and compared, although due to time and costs not every material was fully characterized. Conducted tests were the determination of the melt flow rate (MFR), viscosity measurements via cone-plate and plate-plate rheometers, UL 94 burning tests, tensile tests at three different temperatures, determination of heat deflection temperature and microscopy. During 6 separate runs on the kneader the recipes were improved. The two most promising recipes were successfully processed at a compounder and re-characterized. Only minor differences were found compared to the mixtures processed in the kneader. A recipe recommendation can therefore be made for pipes that are subjected to an FM 4922 test. The concerns that polymers with very high viscosity make it impossible to produce a homogeneous compound with more than 50 weight percent (wt%) of mineral filler without causing significant damage to the polymer, have not been confirmed. After finding suitable parameters that created enough shear forces, mixtures with low amounts of inhomogeneity could be produced on both the kneader and the compounder. What was surprising was the pronounced color differences between the compounds caused by the magnesium hydroxide coatings. Furthermore, masterbatches that contain low viscosity polymers were identified to result in a significant decline of quality of the produced material regarding flammability and mechanical properties.