- /
- Standard / ISO-9727-4
ISO 9727-4
ISO 9727-4
This standard, ISO 9727-4, has been formulated by the International Organization for Standardization (ISO) Technical Committee ISO/TC 87, Cork, and is an internationally recognized standard. It specifies a test method for determining the percentage of diameter recovery of cylindrical cork stoppers after compression. This standard is part of the complete ISO 9727 series of physical tests for cork stoppers and is one of the most important measures of cork performance: the capacity to expand and reseal without problems following compression during the bottling process. The testing instruments provided by Presto are ideal for manufacturers and quality teams looking for precision to reliably validate compliance with this standard.
Significance
The ability of a cork stopper to recover after compression is directly related to its sealing ability after it is placed in a bottle neck. If a stopper doesn't recover properly, the bottle is susceptible to leakage, oxidation, and product spoilage. ISO 9727-4 allows the manufacturer to have an objective and reproducible tool to evaluate cork quality before products are sold to the end consumer by quantifying the recovery percentage under controlled conditions. Closure integrity is essential in the wine, spirits, and beverage sector, where it ensures product preservation and brand integrity. Scope ISO 9727-4 applies to all sorts of cylindrical cork stoppers, either ready to use or semi-worked, that are meant to be inserted completely into the bottle neck, which is usually called a "straight cork stopper." The test determines diameter before and after compression under specified environmental conditions of temperature and humidity. Presto's compression testing instruments are able to provide accurate, repeatable measurement of this process, helping cork producers and bottlers maintain consistent quality standards and ensure compliance with global regulations with confidence.