Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 3: Determination by oven test

This document establishes a standardized method for evaluating the thermal stability of materials used in the coloring of plastics, specifically during processing operations. It focuses on the determination of heat resistance by employing a controlled oven testing procedure, which allows for consistent assessment of how colorants and colored compounds withstand elevated temperatures. The approach outlined in this specification provides a unified protocol for manufacturers and testing laboratories to analyze the degradation characteristics of plastic coloring agents under defined thermal conditions. By utilizing a regulated oven environment, the method ensures reproducible results that facilitate the comparison of different material formulations. The procedure details the setup, operation, and interpretation of tests designed to measure the extent of discoloration or decomposition when subjected to specific heat levels over set durations. This technical framework supports quality control processes within the plastics industry by offering a reliable means to verify the suitability of coloring materials for high-temperature processing applications without requiring complex or variable experimental setups.