ISO 9727-4:2007

Overview

ISO 9727-4:2007 is an essential international standard that specifies the test method for determining the dimensional recovery after compression of cylindrical cork stoppers. This standard is applicable to all types of straight cork stoppers-both ready-for-use and semi-worked-designed to be fully inserted into a bottle neck. The test evaluates how well cork stoppers return to their original diameter after being compressed, a critical factor in ensuring an effective seal in bottling applications.

Developed by ISO Technical Committee ISO/TC 87 on Cork, this part of the ISO 9727 series supports quality control and manufacturing consistency in cork stopper production. By establishing uniform test procedures and requirements, ISO 9727-4:2007 enhances the reliability and performance of cork stoppers across the beverage industry.

Key Topics

• Scope: Applicable to cylindrical cork stoppers intended for full bottle neck insertion; focuses on diameter recovery post-compression.
• Test Method: Measurement of cork diameter before and after compression using precise vernier gauges and a bottling machine with regulated compression jaws.
• Environmental Conditions: Tests are conducted at 21 °C ± 4 °C and 60 % ± 20 % relative humidity to ensure consistent and repeatable results.
• Sampling Requirements: Selection of stoppers without visible defects such as abnormal shapes or surface irregularities to maintain test accuracy.
• Calculation: Diameter recovery percentage is calculated by comparing pre- and post-compression diameters, with results averaged and reported along with standard deviation.
• Test Reporting: Detailed reporting includes sample identification, sampling methodology, measured results, and any deviations that might influence outcomes.

Applications

ISO 9727-4:2007 is primarily utilized in industries where cylindrical cork stoppers serve as sealing components, including:

• Wine and Spirits Bottling: Verifying cork stopper resilience to compression ensures proper sealing, preserving product quality and shelf life.
• Quality Assurance: Manufacturers use this standard to monitor cork quality and dimensional stability, optimizing production processes.
• Material Research: Facilitates analysis of cork materials under compressive stress, aiding in product improvement and development.
• Regulatory Compliance: Helps producers meet international expectations for cork performance in bottling applications.

By applying ISO 9727-4:2007, businesses can enhance customer confidence, reduce leakage risks, and streamline cork stopper specifications to meet market demands.

Related Standards

ISO 9727-4:2007 is part of the broader ISO 9727 series addressing physical tests for cylindrical cork stoppers:

• ISO 9727-1: Determination of dimensions - foundational measurement methodology.
• ISO 9727-2: Determination of mass and apparent density for agglomerated cork stoppers.
• ISO 9727-3: Determination of humidity content - critical for assessing cork preservation.
• ISO 9727-5: Determination of extraction force - measuring ease of stopper removal.
• ISO 9727-6: Determination of liquid tightness - ensuring the stopper prevents leaks.
• ISO 9727-7: Determination of dust content - assessing cleanliness and quality.

Additionally, ISO 633 provides the vocabulary and essential terminology referenced within ISO 9727-4:2007, facilitating standardized communication in cork testing.

By adhering to ISO 9727-4:2007, manufacturers and quality control laboratories ensure the reliable performance of cylindrical cork stoppers, maintaining high standards in bottling industries worldwide. This standard supports consistent testing protocols, leading to enhanced product integrity and customer satisfaction.