Anti-theft door is a door that every household must use. The anti-theft door is the protector of our home security. It has both anti-theft and safety properties. Therefore, the installation of anti-theft doors is also very important. Only when the installation is reasonable and accurate can it play its anti-theft effect. So what are the levels of security doors and how are they distinguished? Specific Thickness The thickness of the steel plate determines the impact resistance. The thickness of door frame cold-rolled steel plates: grades A, B, C and D are 2 mm, 2-1.8 mm, 1.8-1.5 mm and 1.5 mm respectively. The thickness of the outer panel of the door leaf: Class A, B, C and D are 1 mm, 1 mm, 0.8 mm and 0.8 mm respectively. The thickness of the inner panel of the door leaf: grades A, B, C and D are 1 mm, 1-0.8 mm, 0.8 mm and 0.6 mm respectively. Compared with fillings, the reporter found from the Internet that the state stipulates that at best, honeycomb paper should be used as filling for anti-theft doors. During the interview, the reporter found that the fillings of Class A doors vary depending on the brand, and some are aluminum silicate. Rock wool (fireproof wool), some are aviation honeycomb aluminum, and some are aluminum foil. Under normal circumstances, Class B security doors use rock wool and polyurethane foam. The advantage of rock wool is that it has good flame retardant properties and is a poor conductor of heat. The polyurethane foam has no gaps after filling, and the bond is strong after curing. It is shockproof and compressive, does not crack, corrode or fall off after curing. It has ultra-low temperature thermal conductivity and is resistant to heat preservation. Efficient insulation, sound insulation, waterproof and moisture-proof after curing. Class C and Class D fillings are generally honeycomb paper on the market, which basically has no thermal insulation, fire protection and sound insulation properties. Anti-theft locks are the most important component of doors than locks. The performance of anti-theft locks is directly related to the security of the door. A few days ago, reporters visited a number of security door sales stores near the No. 322 Hospital and found that anti-theft doors produced by regular manufacturers will have a "security level mark" printed in Song dynasty on the upper left corner of the door. The anti-vandal time is because of the level. Different and distinct. Grade A should be no less than 30 minutes, Grade B should be no less than 15 minutes, Grade C should be no less than 10 minutes, and Grade D should be no less than 6 minutes. At the same time, observe the number of locking points between the door frame and the door leaf. Class A, B, C and D security doors should have no less than 12, 10, 8 and 6 respectively. The above introduces these methods in detail to distinguish the level of anti-theft doors. I believe you should have some understanding and some distinction between them. In order to ensure normal use in the later period, it is best to pay attention to checking yourself. The anti-theft doors and the wood at home Doors and windows are the safety guarantee of your home. Everyone must do relevant inspections. If there are problems, correct them immediately to avoid problems later and cause more trouble.