PVDF has a high resistance to most chemical compounds, which makes it suitable for transporting numerous chemicals. Its resistance to chlorinated agents (chlorine dioxide, chloramines, sodium hypochlorite ...) makes it a prime candidate for hot water transport applications, including hospital and public environment where aggressive treatments using chlorinated agents are commonly used. The technical challenge to achieve here is to ensure the integrity of the piping system exposed to chlorine treatments while maintaining a high quality of the water transported through the pipes (low accumulation of biofilm on the inner layer surface). Arkema® has developed a technical solution consisting of a 100% thermoplastic multilayer tube (MLT) comprising: i) a primary layer made of polyolefin (HDPE PP ...), ii) functionalized tie layers to ensure good compatibility between the layer structure and the inner layer and iii) a PVDF layer providing resistance to chlorinated agents and resistance to hydrolysis while in compliance with European regulations for potable water transport (ACS, KTW, KIWA…) This presentation aims to explain the adhesion mechanisms in multilayer structures obtained by coextrusion. The impact of the coextrusion conditions, the surface chemistry of the tie layers and the PVDF barrier layer on the adhesive properties of the multilayer structure will be discussed. The final part will present the last results obtained after immersion and ageing of these multilayer pipes in hot water (T = 80 ° C, P = 6 bars, t = 2000h) and in chlorinated hot water ([ClO2] = 70 ppm, T = 70 ° C).