A fundamental claim is that nora floor coverings are made of rubber. This means that they don't contain any PVC plasticizers or chlorine-organic compounds (both of which are present in PVC). We also stipulate that the rubber we use fulfils strict ecological specifications, which can only be met by a few suppliers. We only use rubber of the very highest quality. We also insist that our suppliers are certified in accordance with the international standards ISO 9000 et seq. and ISO 14001. The quality of the raw materials check is regularly verified by independent institutes.