1. Fire rated time ≥1.20h (72 minutes) keep in complete form by ≥950 , the back side door leaf average temperature about 83.8 after≥1.20h (72 minutes) burning.
2.Material:we use domestic or imported high quality cold-rolled steel,electrogalvanizing steel or stainless steel to make the door and frame.
3.The standard steel thickness is 0.8/1.5mm,if you want special thickner steel,also can be ok.
4.Inside infilling is high quality Aluminium silicate wool,which can heatresistant more than 1200 degree.