This repository contains the raw data used to generate figures in P. Yambangyang, R. Wilson, J. Reboud, J. M. Cooper, and A. DemĨenko, (2022). "Ultrasonic Evaluation of Ageing Kinetics in Amorphous Polymer" The raw data are in Matlab format and can be read using the provided m-files. The files are arranged in dedicated folders, following the orders of the Figures in the manuscript. Data were processed using Matlab R2018a.