ISO 17727:2012 describes the quality control sampling plans for the receipt and shipping of ready-to-use cylindrical stoppers (flush with cork mouth finish) in semi-worked or finished cork used for still wines.
These sampling plans apply to the following parameters, for which a standardized analysis method is available. These are the parameters which are applicable to:

physical tests: dimensions, mass and apparent density for agglomerate cork stoppers, moisture content, dimensional recovery after compression, extraction force, liquid tightness and dust content (see ISO 9727),
chemical tests: analysis of oxidizing residues (see ISO 21128),
microbiological tests: enumeration of colony-forming units of yeasts, moulds and bacteria capable of growth in an alcoholic medium (see ISO 10718),
sensory analysis (see ISO 22308),
the analysis of releasable 2, 4, 6-trichloroanisole (TCA) (see ISO 20752).