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FLAGON® TPO membranes were initially used for hydraulic works. However, their range of applicability expanded considerably over time, serving now also as waterproofing membranes for roofing, both for external and internal uses. General features of FLAGON® TPO are excellent weldability, high degradation and atmospheric conditions resistance, high mechanical resistance, flexibility at low temperatures. In addition, they are rotproof, insensible to hot-cold cycles, compatible with most of thermal insulators and resistant to roots growing and microorganisms attacks. However, there are products which are characterised by some peculiar features, being for instance UV-resistant or fireproof. FLAGON® TPO membranes durability is remarkable: at present, 15-yearsold installed membranes does not show any sign of degradation. Indeed, laboratory tests (FLAG & LyondellBasell) foresee a lifetime beyond 25 years. Currently, FLAGON® TPO waterproofing membranes are recognised as the most flexible, easy-to-handle and easily-weldable. Moreover, for a give width, FLAGON® TPO membranes weigh 25% less than PVC ones. This feature makes them particularly suitable when compliance with HQE (High Quality Environmental) standars are required.