ISO 4045-2018 PDF

Full title and description

ISO 4045:2018 — Leather — Chemical tests — Determination of pH and difference figure. This international standard specifies a procedure to obtain an aqueous extract of leather and determine its pH value and the resulting difference figure for quality control and comparative testing of leather materials.

Abstract

This document gives a standardized method for preparing an aqueous extract of leather, measuring the pH of that extract under defined conditions, and calculating the difference figure (a derived value used in leather chemical testing and assessment). The procedure is intended to be applicable to all types of leather and supports consistent reporting between laboratories and industry users.

General information

• Status: Published (confirmed as current in periodic review).
• Publication date: May 2018 (ISO edition published 8 May 2018 / EN adoptions published mid‑2018).
• Publisher: International Organization for Standardization (ISO); adopted versions available from national bodies (e.g., BSI, DIN, ÖNORM).
• ICS / categories: 59.140.30 — Leather and furs.
• Edition / version: Edition 3 (ISO 4045:2018).
• Number of pages: Core ISO document: 3 pages (national/adopted publications sometimes present as extended formatted versions of 9–12 pages).

Scope

Specifies a chemical-testing method to determine the pH value and the difference figure of an aqueous extract of leather. The method covers preparation of the leather extract, the instrumentation and reagents required for pH measurement, measurement conditions, and the calculation and reporting of the difference figure. It is intended for use with all leather types and for routine laboratory or production quality-control testing; it does not replace other chemical or physical test methods for leather beyond pH/difference-figure determination.

Key topics and requirements

• Definition of the aqueous extraction procedure for leather samples (sample size, extraction medium, extraction time and temperature).
• Specification of reagents, calibration procedures and pH-meter requirements (accuracy, temperature compensation).
• Procedure for measuring pH of the leather extract and conditions for repeatable readings.
• Calculation method for the difference figure and instructions for reporting results.
• Requirements for documentation, sample identification and test-report content.
• Notes on precision, repeatability and factors affecting measurement (sample conditioning, dilution, ionic strength).
• Safety and handling recommendations for reagents and laboratory practice.

Typical use and users

Used by leather testing laboratories, tanneries, quality-control personnel, product developers and regulatory/compliance teams to assess the acidity/alkalinity characteristics of leather and to monitor process control. Also used by research organizations and material-specification engineers who require standardized pH/difference-figure data for comparison between batches, suppliers or treatment processes.

Related standards

ISO 4045:2018 replaces the earlier ISO 4045:2008 edition. There are adopted national and regional versions (for example, EN ISO 4045:2018 / BS EN ISO 4045:2018 and DIN EN ISO 4045:2018) which reproduce the ISO method with national forewords and formatting. The standard sits alongside other ISO and EN methods for leather chemical and physical testing (national adoption documents provide cross-reference information).

Keywords

leather; chemical tests; pH; difference figure; aqueous extract; IULTCS; quality control; leather testing; ISO 4045:2018.

FAQ

Q: What is this standard?

A: ISO 4045:2018 is an international standard that specifies a method for determining the pH and the difference figure of an aqueous extract of leather; it provides a repeatable laboratory procedure for these chemical tests.

Q: What does it cover?

A: It covers sample extraction for leather, the measurement of pH under defined conditions, calculation of the difference figure, and requirements for reporting results. It applies to all types of leather and is intended for routine testing and quality control.

Q: Who typically uses it?

A: Leather testing laboratories, tanneries, QC teams, product developers, material engineers and researchers who need standardized pH and difference-figure data.

Q: Is it current or superseded?

A: ISO 4045:2018 is the current edition (edition 3, published in May 2018) and has been confirmed in ISO's periodic review; it supersedes ISO 4045:2008. National and regional adoptions (EN, BS, DIN, etc.) were published in 2018.

Q: Is it part of a series?

A: It is one of several ISO/EN methods for leather chemical testing and is associated with other leather-testing standards and national adoptions; while not a multi‑part series itself, it complements other leather test standards used by IULTCS and technical committees.

Q: What are the key keywords?

A: pH; difference figure; leather extract; chemical tests; leather testing; ISO 4045; quality control; IULTCS.