Abstract: “This paper aims to provide a comprehensive tool for evaluating the curing process of felt reinforced polyester resin composites used in the Cured In Place Pipe (CIPP) renovation techniques. During in-situ construction and renovation of pipelines, working time and temperature are important to precisely control the CIPP process. In this study the amount of catalyst used was varied in the range of 2-4%. The viscoelastic properties of the formulations were then investigated with the aid of Dynamic Mechanical Analyser (DMA) in the penetration mode. The results gave a full analysis of the curing process by providing measurements of different parameters including working time, gelation, vitrification and glass transition temperature of the resin-felt composite system. To clarify the thermal properties of the resin system a comprehensive profile of time temperature transformation (TTT) has been constructed for the different amount of catalyst used. The main purpose of the TTT profile was to de”

Keywords: Polyester, cure, vitrification, DMA, CIPP, TTT Working time