ISO 19070:2016

Overview

ISO 19070:2016 sets out an internationally recognized method for the chemical determination of N-methyl-2-pyrrolidone (NMP) in leather and leather components. Developed by ISO in collaboration with IULTCS (International Union of Leather Technologists and Chemists Societies) and CEN, this standard provides laboratories, regulatory bodies, and manufacturers with a reliable approach to monitor and control NMP content in leather products. ISO 19070:2016 also extends its applicability to the determination of N-ethyl-2-pyrrolidone (NEP), supporting both compliance and product safety objectives.

Key Topics

• Purpose: To measure the amount of N-methyl-2-pyrrolidone (NMP) and N-ethyl-2-pyrrolidone (NEP) in leather materials.
• Method Summary: The method is based on:
  • Extraction of the leather sample using acetone and ultrasonic bath.
  • Analysis by gas chromatography with mass selective detection (GC-MS).
  • Quantification by comparison with calibration standards.
• Sample Preparation: Leather is cut into small pieces and extracted for one hour at 50°C with acetone.
• Performance: The standard prescribes a quantification limit suitable to meet regulatory requirements (for NMP, the limit is typically 5 mg/kg).
• Reporting: Test reports must reference ISO 19070:2016 and include sample identification, test results (mg/kg), detection limit, and any deviations from the standard procedure.

Applications

ISO 19070:2016 is crucial for a range of stakeholders in the leather sector:

• Manufacturers: Ensuring compliance with chemical safety regulations, notably REACH regulations in the EU, which classify NMP as a substance of very high concern (SVHC).
• Testing Laboratories: Offering a standardized GC-MS based protocol for consistent and reliable determination of NMP and NEP.
• Quality and Regulatory Compliance: Supporting due diligence for brands and suppliers by documenting NMP levels and ensuring thresholds are not exceeded.
• Product Development: Assisting R&D and technical teams in evaluating process chemicals and final product safety.
• Market Access: Providing the documentation needed for exports, particularly to markets with stringent chemical requirements, such as Europe.

By following ISO 19070:2016, organizations can demonstrate responsible chemical management within their leather supply chains.

Related Standards

To ensure accurate and repeatable results, ISO 19070:2016 should be used in conjunction with other relevant leather testing standards:

• ISO 2418: Leather - Chemical, physical, mechanical, and fastness tests - Sampling location
  • Specifies methods for taking representative samples from leather materials.
• ISO 4044: Leather - Chemical tests - Preparation of chemical test samples
  • Details procedures for sample preparation ahead of chemical analysis.

Other applicable standards may include test methods for additional restricted substances in leather and guidelines for product safety and environmental compliance.

Leveraging the protocols described in ISO 19070:2016 ensures accurate determination of NMP in leather products, supports regulatory compliance, and fosters trust in supply chain management for global leather industry stakeholders.