Now each family began to enhance their own security, security door is the most important, more than a layer of doors can more protect the safety of our own and family. So what are the grades of security doors?  The following security door to take you to understand.  

Grade A: according to the regulation of the country, class A door to prevent theft from outside destruction time shall not be less than 30 minutes, class A door body steel thickness must be 2mm.  No matter what form of abnormal opening means used by the outside world, the security door can not be opened within 30 minutes, nor can it be opened by destroying the steel door body.  

Grade B: according to the regulation of the country, class B anti-theft door to prevent outside destruction time shall not be less than 15 minutes, the steel thickness of class B anti-theft door body must be 2mm.  No matter what form of abnormal opening means used by the outside world, the security door can not be opened within 15 minutes, nor can it be opened by destroying the steel door body.

Grade C: according to the regulation of the country, third class anti-theft door to prevent outside destruction time shall not be less than 10 minutes, the steel thickness of the door body of third class anti-theft door must be 1.8mm.  No matter what form of abnormal opening means used by the outside world, the security door can not be opened within 10 minutes, nor can it be opened by destroying the steel door body.  

Grade D: according to the provisions of the state, class D anti-theft door anti-external damage time shall not be less than 6 minutes, class D anti-theft door steel thickness must be 1.5mm. No matter what form of abnormal opening means used by the outside world, the security door can not be opened within 6 minutes, nor can it be opened by destroying the steel door body.