Durable steel is a synthetic fireproof plate composed of two punching steel sheets strongly pressed on fiber cement and was evaluated as non-combustible component after a number of international tests. Also, it has the characteristics of high moisture resistance. It has definite remarkable anti-explosion and fireproof function because it will not absorb combustible liquid. Also, it has ultrastrong crashworthiness and explosion resistance, so as to resist traditional fiber flame, hydrocarbon flame and even fuel injection flame for a long time. Meanwhile, because of its low hygroscopicity, it can also resist high-pressure water column spraying so as to be used externally. Also, it will not be damaged due to dampness or watering of spray-head during initial delivery and system installation.