1) Material:

Door leaf: consist of 7 layers, the middle is aluminum honeycomb, double galvanized steel plate, double HDP,double fasion fireproof , dampproof,  sound insulation surface plate

Door pocket: aviation aluminum magnesium alloy

Airproof seal: silica gel , in ordinary temperature , it can be  smokeproof, sound insulation

Expanded airproof seal: When the temperature reach 80 degree, the airproof seal begain to expand, nothing can go into and it will be safety enough. When our side is 1100 degree, the inner is only 140 degree.

Our door is the real inner firefroof fasion safety door.

2) Thickness of door leaf: 4cm