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凝胶状物质具有液体和固体两种特性。即在不加外力时始终保持一定状态，而对其施加外力时形状可自由变化。使用凝胶化燃料时该特性具有很大作用。即凝胶化燃料可以贮存在与液体燃料同样的燃料箱内，而且对其加压可以喷射。由于凝胶化燃料具有液体与固体的特性，因此，与液体推进剂同样容易处理，而且更安全，可望成为未来的推进剂。凝胶化硝酸（ＨＮＯ３）与缩水甘油叠氮聚醚（ＧＡＰ）的理论比冲可达２３５２Ｎ·ｓ／ｋｇ。另外，试制的凝胶化硝酸的喷射特性在喷咀直径为０．２ｍｍ以上时与水的相同，在振动试验中没有发生断裂等，证明了试制的凝胶是稳定的。用试制的凝胶化硝酸作氧化剂与以ＡＰ系复合推进剂的分解气体作为混合火箭进行燃烧试验取得了７５％～８０％的Ｃ＊效率。
Gel-like substances have both liquid and solid properties. That is, always maintain a certain state when no external force is applied, and the shape can be freely changed when external force is applied to it. This feature is useful when using gelatinized fuels. That is, the gelated fuel can be stored in the same fuel tank as the liquid fuel, and can be injected under pressure. Because of their liquid and solid properties, gelatinized fuels are as easy to handle and safer as liquid propellants and are expected to be propellants of the future. The theoretical specific impulse of gelled nitric acid (HNO3) and glycidyl azide polyether (GAP) is up to 2352N · s / kg. In addition, the spray characteristics of the prepared gelled nitric acid were the same as that of water when the nozzle diameter was 0.2 mm or more, and no breakage or the like occurred in the vibration test, which proves that the prototype gel was stable. The C * efficiency of 75% -80% was achieved by using the pilot gelled nitric acid as the oxidant and the decomposition gas of the AP series compound propellant as the mixed rocket combustion test.