ISO 5537-2023 PDF

Full title and description

ISO 5537:2023 — Dried milk and dried milk products — Determination of moisture content (reference method). This international standard specifies a laboratory reference method for determination of moisture content in all types of dried milk and milk-derived powders, intended for use where traceable and reproducible results are required for quality control, specification testing and regulatory purposes.

Abstract

This document defines the reference gravimetric procedure for measuring moisture content in dried milk and dried milk products. It updates and replaces the previous edition to reflect collaborative study findings and to clarify repeatability and reproducibility performance criteria for a broad range of milk powders and related products.

General information

• Status: Published.
• Publication date: 17 July 2023.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 67.100.10 (Milk and processed milk products).
• Edition / version: Edition 2 (2023).
• Number of pages: 9 pages.

Scope

ISO 5537:2023 applies to all types of dried milk and dried milk products (including skim and whole milk powders, whey powders, permeate powders, cream powder and certain infant formula powders) and specifies the reference technique for determination of moisture content. The method is intended to be the definitive laboratory reference for calibrating routine methods and for use when legally or technically required.

Key topics and requirements

• Reference gravimetric procedure for moisture determination (principles and stepwise method).
• Sample preparation, representative sampling and laboratory conditions.
• Specified drying conditions, temperatures and apparatus requirements to ensure traceability.
• Performance criteria including repeatability and reproducibility limits derived from collaborative studies.
• Reporting requirements and expression of results (moisture content on a mass basis).

Typical use and users

Used by analytical laboratories in the dairy industry, national reference laboratories, regulatory bodies, standards organizations and research institutions. Typical applications include official reference testing, inter-laboratory comparisons, method validation and calibration of routine or rapid moisture measurement techniques.

Related standards

ISO 5537:2023 is a technical revision of ISO 5537:2004 (ISO 5537 | IDF 26:2004 withdrawn and replaced). It is associated with IDF technical work on moisture measurement and complementary collaborative study reports that informed the revised performance criteria. National and regional adoptions (for example EN/UNE/ÖNORM variants) may incorporate the same text or tracked-change editions for regional publication.

Keywords

dried milk; milk powder; moisture content; reference method; gravimetric determination; IDF 26; method validation; repeatability; reproducibility.

FAQ

Q: What is this standard?

A: ISO 5537:2023 is the international reference method standard for determining moisture content in dried milk and related milk powders, providing a gravimetric laboratory procedure for accurate, traceable results.

Q: What does it cover?

A: It covers sample handling and preparation, the specified drying procedure and apparatus, calculation and expression of moisture content, and performance criteria (repeatability and reproducibility) based on collaborative study data.

Q: Who typically uses it?

A: National reference and commercial dairy laboratories, regulators, test-house laboratories, manufacturers of milk powders, and standards bodies use the standard for reference testing, validation and to support routine method calibration.

Q: Is it current or superseded?

A: Current — ISO 5537:2023 (published 17 July 2023) supersedes ISO 5537:2004 (withdrawn).

Q: Is it part of a series?

A: It is part of ISO/TC 34/SC 5 dairy product analytical methods and is published in parallel with IDF work (historically referenced as ISO 5537 | IDF 26). Related standards cover other compositional and microbiological methods for milk and milk products.

Q: What are the key keywords?

A: Dried milk, milk powder, moisture, gravimetric method, reference method, repeatability, reproducibility, IDF 26.