Waterstops are made of elastomers of different characteristics. They are available in nitrile or flexible PVC (Vedaflex). Nitrile waterstops are characterised by a higher breaking elongation, excellent resistance to chemical agents as well as to ageing, and permanent elasticity that is comparable to that of rubber. Welded joints are very easy to produce. Flexible PVC waterstops are made from basic raw materials of high quality, but offer an economical solution.