Liquid oxygen is classified as a nonflammable substance, however, it possesses the ability to significantly enhance combustion. Specifically categorized as a Class B fire hazard, it does not generally undergo spontaneous combustion upon contact with fuel. When liquid oxygen and liquid fuel come into contact, the former causes the latter to cool down and solidify. Consequently, mixtures consisting of solidified fuel and liquid oxygen demonstrate sensitivity to impact and tend to become explosive when subjected to pressurized conditions.
There are two types of combustion reactions.
One important point to note is that while fuel and liquid oxygen do not combust when combined, the resulting mixture can explode if it is either ignited or exposed to mechanical force.
When the other type of liquid oxygen and fuel intersect, they ignite causing fire and combustion. These combustion reactions result in repeated explosions. The efficiency of the fuel directly impacts the intensity of the combustion reaction.