Security seals are mechanisms utilized to seal shipping containers in a fashion that provides tamper evidence and several amount of security. Such seals will help to detect theft or contamination, either accidental or deliberate. Security seals are commonly accustomed to secure truck trailers, vessel containers, chemical drums, airline duty-free trolleys and utility meters. Typically they are really considered a cheap way of providing tamper proof intrusion into sensitive spaces.
Security seals may be split into two main groups: single use and reusable. Single use seals are typically created from plastic or metal, along with the used material and production technology is extremely important to the security level. Reusable seals usually are electronic or mechanical as opposed to just manufactured from plastic, and in case purely plastic, just one part is reusable. Electronic and mechanical seals are usually used for the transportation industry, with seal fixed to the rear of trucks, trailers and shipping containers. A reusable mechanical or electronic seal can be fitted into the rear or loading doors, extending a cable from itself through fixing points on the doors, so when sealed establishing a unique number which happens to be logged. If the door is next opened this number changes, therefore it provides tamper evidence for your load.
The prerequisites beyond doubt security measure of seals are defined inside the ISO 17712. The seals that are members of the High security level and Security level are also called "barrier seals". They are made of different metals or metal alloys, which means that they require special tools to get opened, for example bolt cutters or pliers. Cable seals and bolt seals also fall into this category. Intended to deter opportunistic theft of high value goods, additionally they is sometimes branded and numbered to enhance tamper resistance and still provide excellent security for containers. The seals that happen to be within the Indicative level concerning ISO 17712 are created from plastic or thin metal.
Cable seals provide for more versatile application, when they have variable entire locking mechanism limited only via the cable length. Typical applications include sealing trucks and railway cars transporting valuable commodities. An internal locking mechanism prevents the cable from being retracted. Most cable seals are classified as security or high security level regarding ISO 17712.
All ISO 17712 compliant seals are numbered on both seal body and head, to prevent substitution of either part. Normally, this is done using laser marking, which can not be rubbed off.
Ball seals are generally used in securing trucks. They contain a metal strip using a punched hole, linked to a housing section. If the strip is bent and threaded via the hole, a ball inside the housing section locks it set up. Most ball type seals belong only to the indicative level about ISO 17712.