Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride

This document establishes a standardized analytical method for determining the content of free acids within acid anhydrides used as curing agents and accelerators in the epoxy resin system. The procedure is specifically designed for applications involving thermosetting plastics where precise control over the curing reaction is essential. It outlines detailed requirements for sampling, reagents, and experimental conditions to ensure consistent and reproducible results across different laboratories. The methodology relies on titration techniques that are widely recognized for their accuracy in quantifying acidic impurities. By following these guidelines, manufacturers and quality control personnel can assess the purity of acid anhydride materials before they are incorporated into epoxy formulations. This approach helps in preventing potential defects in the final cured product caused by uncontrolled acid content. The text provides step-by-step instructions for performing the analysis while maintaining strict adherence to safety and measurement protocols. The scope of this work covers the general principles applicable to various types of acid anhydrides utilized in the polymer industry. It serves as a reference point for technical personnel engaged in material testing and process optimization within the manufacturing sector.