Your regular update for technical and industry information

Your regular update for technical and industry information

ISO 4045:2018: Testing standard of pH value in leather is now published

may 2018 - Relevant for: softlines INDUSTRY

In May 2018, the International Organization for Standardization (ISO) published the standard of ISO 4045:20181. It is a testing method to evaluate the pH value of an aqueous leather extract. This testing method is applicable to all types of leather. The pH value is a measurement of acidity or alkalinity of a solution or a material. Highly acidic or alkaline leather sample may cause skin allergy reaction. The pH value testing has been an industry norm for leather products e.g. apparel and footwear. The technical changes of the latest standard are minor but the updated standard gives more clarify in testing procedures. Please refer to the highlights of changes in the new version.

Table A: Highlights of the key change based on ISO 4045:2018



Title of the standard

The “difference figure” is included in the standard title. The amendment of the title gives more clarity of the testing method.

Update of reagents and Apparatus (Clauses 5.1 and 6.1)

  • Water quality is specified as “minimum grade 3” rather than “Grade 3” in the previous version.

  • Rotating shaker or other suitable shaker after validation is now suggested as apparatus.

Sample preparation
(Clause 8)

More details are given to explain the procedure e.g. standardization of the pH meter

Determination of the difference figure
(Clause 8.4)

Further elaboration is given to determine the difference figure

[1] ISO 4045:2018


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