Overview
ISO 25712:2026 specifies a standardized method for determining the total content of melamine in chemicals used in the leather tanning industry. This international standard was developed by ISO and the IULTCS Chemical Test Commission to help ensure the safety, compliance, and quality of chemicals introduced during leather production. The procedure described utilises liquid chromatography (LC) coupled with either a mass spectrometer (MS/MS), ultraviolet detector (UV), or diode array detector (DAD) for the accurate detection and quantification of solvent-extractable melamine.
Melamine is commonly present as a residual monomer in resins such as melamine-formaldehyde, which are used in the retanning stage of leather processing. Due to its classification as a substance of very high concern (SVHC) in the EU, reliable testing of melamine content in auxiliary chemicals is essential for regulatory compliance and environmental safety.
Key Topics
- Scope of the standard: Application to solvent-extractable melamine in chemicals for leather tanning.
- Detection methods: Utilises LC-MS/MS, LC-MS, LC-UV, or LC-DAD for melamine identification and quantification.
- Sample preparation: Specifies extraction procedures using a 50:50 acetonitrile-water mix and outlines preparation of calibration and control solutions.
- Instrumental parameters: Recommends key conditions for chromatographic separation using either hydrophilic interaction liquid chromatography (HILIC) or reversed-phase (C8/C18) columns.
- Calculation of results: Describes formulas for melamine content determination, both with and without internal standards.
- Reporting requirements: Lists critical data to be included in laboratory test reports, ensuring transparency and traceability.
Applications
Implementing ISO 25712:2026 provides practical value across several domains:
- Chemical suppliers: Ensures that tanning agents and auxiliary chemicals for the leather industry meet strict safety and environmental standards, reducing risk of non-compliance and product recalls.
- Leather manufacturers: Provides a validated tool to monitor raw material purity, supporting compliance with European and international regulations related to SVHCs such as melamine.
- Analytical laboratories: Offers a clear, repeatable methodology for melamine testing using widely accessible liquid chromatography systems, supporting consistent interlaboratory results.
- Regulatory bodies: Assists in establishing benchmarks for chemical safety in the leather supply chain, enhancing consumer protection and sustainability in leather production.
By adopting this standard, organizations demonstrate their commitment to quality assurance, regulatory conformity, and responsible environmental practices.
Related Standards
Organizations involved in the leather and chemical sectors may also reference these related standards:
- ISO 17075 - Determination of chromium(VI) content in leather
- ISO 14001 - Environmental management systems for organizations, including process industries
- ISO 2418 - Leather - Chemical, physical, mechanical and fastness tests - Sampling location
- ISO 17234 - Leather - Chemical tests for certain aromatic amines derived from azo colorants
Establishing comprehensive chemical testing strategies by integrating ISO 25712:2026 with other relevant standards supports robust quality control, risk management, and legal compliance across the entire leather manufacturing supply chain.
By following ISO 25712:2026, companies ensure precise melamine determination in leather tanning chemicals, aligning with international best practices for safety and quality in the leather industry.
Open preview (PDF)Chemicals for the leather tanning industry — Determination of the total content of melamine