ISO 7513:1990/Amd 1:2012

Overview

ISO 7513:1990/Amd 1:2012 is an international standard developed by the International Organization for Standardization (ISO) that specifies the method for determining the moisture content in instant tea in solid form. The moisture content is measured as the loss in mass when the tea is heated at 103 °C. This amendment updates the original 1990 standard to clarify testing procedures and ensure consistent, reliable measurement of moisture content in instant tea products worldwide.

Maintaining accurate moisture content is crucial for quality control, product stability, and shelf life of instant tea. This standard provides a reliable and reproducible approach tailored specifically to instant tea powders and granules, making it a critical reference for food manufacturers, quality laboratories, and regulatory authorities.

Key Topics

• Scope of Measurement: Moisture content is defined as the percentage loss in mass of solid instant tea when heated in air at approximately 103 °C until a constant mass is achieved, typically over 4 hours.
• Clarification on Volatiles: The standard acknowledges that other volatile substances may contribute minimally to mass loss but are considered negligible for practical moisture determination.
• Updated Drying Procedure: Amendment 1 refines drying time, specifying heating to constant mass rather than a fixed 2-hour duration to enhance accuracy.
• Equipment and Conditions: The loss in mass measurement requires accurate weighing bottles or dishes, an oven with precise temperature control (103 ± 2 °C), and consistent handling techniques.
• Technical Committee Oversight: Prepared by ISO Technical Committee ISO/TC 34 (Food products), Subcommittee SC 8 (Tea), ensuring expert input and industry relevance.

Applications

• Quality Control in Tea Manufacturing: Ensures instant tea products meet moisture specifications to prevent caking, microbial growth, and loss of flavor.
• Shelf Life Estimation: Accurate moisture content helps predict storage stability and packaging requirements.
• Regulatory Compliance: Assists manufacturers and regulators in verifying product conformity with food safety and labeling standards.
• Research and Development: Supports product formulation improvements and evaluation of processing conditions affecting moisture retention.
• International Trade: Establishes a uniform testing method recognized globally, facilitating international commerce of instant tea.

Related Standards

• ISO 3676 - Determination of dry matter content for foods related to instant powders.
• ISO/IEC Guide 98-3 - Guide to the expression of uncertainty in measurement, relevant for precise moisture analysis.
• Codex Alimentarius Standards for Tea - Provides complementary regulations on tea product safety and quality.
• ISO 1442 - Meat and meat products moisture content determination, useful for principles in moisture testing.
• ISO 17025 - General requirements for the competence of testing laboratories, applicable for certification of moisture testing facilities.

By following ISO 7513:1990/Amd 1:2012, stakeholders in the instant tea industry can ensure moisture content is accurately measured, contributing to product excellence and consumer safety. This standard is essential for laboratories and manufacturers aiming to uphold international quality benchmarks in tea production.