ISO/PAS 17712 establishes uniform procedures for the classification, acceptance, and withdrawal of acceptance of mechanical freight container seals. It provides a single source of information on mechanical seals which are acceptable for securing freight containers in international commerce. It addresses all types of security seals usable on maritime containers. Since many other industries use the same seals, members of those industries also may choose to adopt ISO 17712. ISO/PAS 17712 is not applicable to special-purpose seals, such as fibre-optic or sophisticated electronic seals.
In September 2010, International Standard 17712, Mechanical seals (ISO 17712) replaced the Publicly Available Specification 17712 (ISO/PAS 17712). 17712 is now a fully-fledged ISO International Standard.
Compliance with ISO 17712 requires independent confirmation in three areas:
- Physical testing to determine a seal’s classification for physical strength.
- Process auditing of supplier security-related business processes.
- Physical testing that earns a “Pass” grade for evidence of tampering. Please note that the tamper test grade is not required until 1st March 2012.
The new changes published in ISO 17712: 2010 have addressed technical issues, added testing for tamper evidence and established an 18 month transition buffer after publication for critical issues.
Most of the technical changes that affect accredited testing labs, which must have ISO 17712 included in their scope of competence, have clarified test fixture designs and added specificity to the test procedures. Also, it was established that an 18mm minimum be the widest diameter for bolt seals. With an 18 month transition buffer, this would accommodate manufacturer’s tooling requirements and particularly to allow seal inventory adjustment throughout bolt seal supply chains. Additionally, seals will also be required to have markings of high security (“H”), security (“S”) and indicative (“I”) on each seal.
- High Security – The strongest type of seal. Provides the most protection for shipments and serves the purpose of delaying or discouraging intruders. It is designed to keep people out or make it extremely difficult for them to gain access to your high-risk and high-value shipments. Requires heavy-duty bolt or cable cutters for removal.
- Security – The middle ground. Shows whether your application has been tampered with, but is stronger and provides limited resistance. Commonly used when indicative seals can’t stand up to an application or are damaged unintentionally. Cable cutters or other lightweight tools are used for removal.
- Indicative – The simplest type of seal. Shows whether your application has been tampered with, but doesn’t prevent someone from accessing it. Used for low-risk applications and can be pulled apart by hand or cut with a simple shear or snipping tool.
Testing for tamper evidence is the most important change. Customs regulators in the European Commission approached ISO and expressed strong interest in tamper testing and vetting of security seals. There is one main goal: to facilitate maintenance of a common global regime for security seals.
ISO 17712 gives testing labs unusual flexibility in finalizing their test procedures for evidence of tampering. Tamper attempts must leave detectable evidence of tampering in each of three tests; three successes earn a “Pass” grade but an “undetectable” result on any test generates a “Fail” grade for the seal. All classes of seals must earn “Pass” grades to qualify as 17712 compliant.
Beginning 1 March 2012, all ISO 17712 compliant seals must be certified as tamper evident, giving companies peace of mind when using these certified security seals.
For more information on how this affects you, visit the International Seals Manufacturers Association
For all your seal needs, including ISO 17712 Compliant seals, visit Seton.


















