A novel class of metalized hypergolic fuels, termed Hypergolic Aluminized Fuel (HAF), was developed and tested for ignition with 90 weight% H2O2 as the oxidizer.Using NASA-CEA software, two compositions, HAF-7 and HAF-8, were identified based on their high d.-specific impulse, low oxidizer to fuel (O/F) ratio and manufacturability.Despite a high solid loading (≥70 weight%) both fuels exhibited excellent d. recovery ( > 98 %) and good mech. properties (Shore-A hardness > 80).For the first time, ignition delay time (IDT) was systematically examined under varying storage conditions, including vacuum and exposure to humidity, as well as different surface preparations (sanded and not-sanded) for these fuels.Results indicated that prolonged exposure to humidity increased the IDT due to fuel mass gain and reductant degradationA correlation between IDT and fuel mass gain (precipitation) was established, confirming the adverse effects of humidity on ignition performance.Thermal anal. revealed that the HAFs possess a good thermal conductivity when compared to composite solid propellants.Structural characterization using SEM/EDS detected microstructural changes upon exposure to humidity, while PXRD anal. identified phase changes due to oxide formation.Though there are challenges, HAFs maintained an IDT below 5 ms, validating its hypergolic reliability.Reignition tests, which are vital for this class of propellants exhibited minimal IDT variations, confirming repeatability.Notably, HAFs, with high additive loading and no catalyst, demonstrated an IDT range better than those obtained with solid hypergolic fuels made from paraffin wax and other thermoplastics, making it a promising candidate for propulsion applications.Lastly, these HAFs have certain limitations like the lack of long-term storage stability when exposed to humidity effects.However, while HAF-8 exhibited improved performance, HAF-7 showed a better long-term stability, highlighting a trade-off between energetics and chem. stability.