The word TPO comes from English and consists of the initials of the words "thermo plastic olefines”. The word FPO is of German origin with the same meaning and consists of the initials of the words "flexible polyolefine".In short, TPO and FPO are the same products and there is no chemical or mechanical difference between them. The chemical composition of TPO / FPO product includes polyethylene, polypropylene and polyurethane materials. Geomembrane synthetic covers produced from TPO / FPO raw material do not contain PVC or plasticizer additives. With this advantage, hardening- loosening does not occur over time, loss of elasticity and microcrack formation don’t be observed. In addition, ecologically harmful chemicals are not released to the environment. For these reasons, geomembrane synthetic covers made of TPO / FPO raw material can be easily recycled and so it is environmentally friendly. TPO / FPO geomembrane synthetic cover, which is an ideal solution for roofs with constant water contact, is unproblematic and long-lasting.