Plastics - Unsaturated polyester resins - Determination of partial acid value and total acid value

This document establishes a standardized methodology for evaluating the acid characteristics of unsaturated polyester resins, a class of materials widely utilized in composite manufacturing. The procedure focuses on the determination of two key parameters: the partial acid value and the total acid value, which are critical indicators of resin reactivity and storage stability. By providing a uniform experimental approach, the text ensures that analytical results obtained across different laboratories are comparable and reliable. The methodology outlines specific reagents, equipment, and calculation procedures necessary to assess the concentration of acidic functional groups within the polymer matrix. Adherence to this approach facilitates quality control during production and aids researchers in understanding the chemical properties of the resin systems. The standardized procedure contributes to consistent material characterization without implying any specific performance requirements or application mandates.