An Introduction to TPO/FPO waterproofing membrane

TPO waterproofing membraneTPO, abbreviation for Thermoplastic Polyolefin, is the popular name in American market. Similarly, FPO is another name in European market, as abbreviation for Flexible Polyolefin.

Generally TPO/FPO is compound of PP (polypropylen)  and EPR (ethylene propylene rubber)or EPDM, which integrate PP’s weldability and rubber’s flexibility and anti-chemical property, belonging sort of Polyolefin.


In general, TPO/FPO membranes are being marketed as a product that combines the properties of EPDM and PVC without the associated drawbacks that the latter two materials have. In other words, they are supposed to be as UV-resistant and as heat resistant as EPDM, and as heat-weldable as PVC.

PVC modular structure

TPO Modular Structure

Features of TPO/FPO



No plasticizer Improved chemical resistance

Theoretically prolong life span

High chemical resistance Used in environment critical / polluted areas
Bitumen /PS-compatible No separation layer required
Light surface colours Low surface temperature, good for energy saving
High UV resistance Exposed roof
High puncture resistance Less critical to mechanical impact
Seam preparation Improve welding performance


  • Hot air weld seams
  • Adhesive for detailing