Does a UN 4G fiberboard box require recertification or disposal if over two years have passed since its marked date of manufacture?
A. No, periodic retest requirements apply to the manufacture of a design type, not to empty or filled packagings which are in use, or are in inventory awaiting use. Once manufactured in conformance with the marked standard (e.g., UN 4G), the packaging is suitable for use as long as it continues to conform to that standard.
