The country has strict requirements for the production of burglar-proof doors. According to the anti-damage time, the safety grades of burglar-proof doors are divided into four levels: Class A, B, C, and D. Class A is not less than 30 minutes, Class B is not less than 15 minutes, Class C is not less than 10 minutes, and Class D is not less than 6 minutes.
Security doors are available in two materials: steel and stainless steel. The steel thickness of the door frame must be at least 1.5mm, and the door leaf thickness must be at least 0.8mm. The weight of the door is generally over 40kg.
