Overview
SIST ISO 6673:2011, based on ISO 6673:2003, establishes a standardized method for the determination of loss in mass at 105 °C in green coffee. This standard is applicable to both decaffeinated and non-decaffeinated green coffee as defined in ISO 3509. The method offers laboratories, coffee traders, and quality control professionals a way to quantify mass loss under specific drying conditions, which is primarily due to water and some volatile substances.
The loss in mass at 105 °C can be regarded, by agreement, as a measure of water content in green coffee. However, values obtained through this method typically register about 1.0% lower than those produced by the reference method described in ISO 1446. While not the reference method itself, ISO 6673 is extensively applied for routine checks and internal quality controls within the coffee industry.
Key Topics
- Applicable Products: Decaffeinated and non-decaffeinated green coffee beans, as classified by ISO 3509.
- Method Basis: Loss in mass at 105 °C after 16 hours of drying represents water content and minor volatile components.
- Precision and Reproducibility: The procedure has been tested through international interlaboratory studies, ensuring its reliability and repeatability across various laboratories.
- Standardized Procedure: The test involves carefully preparing coffee samples, drying at controlled conditions, and weighing to assess mass loss.
- Reporting Requirements: The standard specifies detailed documentation and reporting practices to ensure clarity, traceability, and comparability of results.
Applications
SIST ISO 6673:2011 is widely used in the coffee trade, by quality assurance labs, and for regulatory compliance. Its practical value includes:
- Moisture Control: Maintaining appropriate moisture content in green coffee is crucial for quality, shelf life, and prevention of mold or spoilage.
- Purchasing and Trade: Business agreements frequently rely on objective measurement of water content to establish product quality and fair pricing.
- Calibration Reference: The method supports calibration and validation of faster, routine water content measurement techniques.
- Process Control: Coffee processors use the method to monitor moisture at intake, during processing, and before packaging to meet industry standards.
- Research and Development: Provides a benchmark for scientific studies on coffee storage, transport, and processing.
Related Standards
Several other international standards are referenced alongside SIST ISO 6673:2011 to provide a comprehensive approach to coffee sampling and analysis, including:
- ISO 3509: Coffee and its products - Vocabulary. Establishes relevant terms and definitions.
- ISO 1446: Green coffee - Determination of water content - Basic reference method. Recognized as the reference procedure for moisture determination, yielding slightly higher results.
- ISO 4072: Green coffee in bags - Sampling. Guides sampling procedures to ensure representative and uncontaminated samples.
- ISO 5725 Series: Accuracy (trueness and precision) of measurement methods and results. Provides principles for verifying method reproducibility and reliability.
By implementing SIST ISO 6673:2011, organizations benefit from harmonized measurements of green coffee mass loss, supporting consistent quality, facilitating international trade, and aligning with best practices in food safety and quality management. Integrating this standard into existing testing protocols promotes trust and transparency across the coffee supply chain.
