Pigments and extenders - Testing of colouring materials in plasticized polyvinyl chloride (PVC-P) - Part 4: Determination of bleeding of colouring materials

This document establishes a specific method for evaluating the migration behavior of colorants within plasticized polyvinyl chloride products containing pigments and extenders. It serves as a standardized procedure for determining how colorants move from the material matrix into surrounding media, which is a critical factor in assessing the stability and safety of PVC-based materials. The method defines the necessary experimental conditions, sample preparation techniques, and measurement protocols to ensure consistent and reproducible results across different testing environments. By providing a uniform approach, this standard facilitates the comparison of data obtained by various laboratories and supports the quality control processes of manufacturers. It focuses exclusively on the technical aspects of the migration test, covering the measurement of colorant transfer under defined conditions. The approach outlined is designed to be applicable to a wide range of plasticized PVC formulations used in industrial and consumer applications. Adherence to these procedures ensures that the testing of colorant mobility is conducted with precision and reliability, supporting regulatory compliance and product performance verification without introducing bias or subjective interpretation into the analytical process.