TheSkyer wrote:Never heard of this before. Are there any "high security" variations on these types of locks, would be pretty ironic
I disagree on the irony. Often times the point of a lock is to serve as a "seal" and as a deterrent. There are situations where you want to deter casual access and have obvious proof if unauthorized access has occurred. A frangible lock with a high security core would allow you to greatly reduce the chances of someone unauthorized tampering with something in an undetectable fashion, yet still allow access in case of emergency.
Often fire extinguishers are put behind glass because people will play with them, discharge them, or steal them. The sort of idiot who would do this may be able to also pick/bypass a low-security lock, and think it is "fun". Frangible locks are the "break glass in case of emergency" for things where glass isn't viable.