SEP 1220-6
Test and documentation guideline for the joinability of thin sheet of steel – Part 6: Adhesive Bonding.
The test methods specified in this Stahl-Eisen test specification (SEP) describe the procedure to determine the suitability of automotive steel sheets for joining via the process of adhesive bonding (with structural adhesives and anti-flutter adhesives). Described are sample preparation, quasi-static lap shear test, undercutting corrosion testing and documentation of results.
Significant changes compared to the 1st edition are updating of the reference adhesives and the number of tests of sandwich specimens.
2nd edition January 2026