compatible to the full pH range of 0-14 in case bad behavior persists, and extreme pH products enter landfills. Inert liners are made from materials that will not corrode regardless of the chemical exposure. PTFE is an example of an inert material. PTFE will not corrode when exposed to virtually any known chemical, and it is compatible to the full pH range of 0-14. Selecting such an inert material simply removes one of the most critical variables, corrosion, from the equation. The consideration of compatibility to chemicals for PTFE is an easy one, as the table below reflects. Reduce the number of different materials-additives and reinforcements Many geomembrane materials contain additives that help provide or enhance CHEMICAL Acetic acid (50%) Acetone Ammonium hydroxide Benzene Diesel Ethyl acetate Furfural Gasoline Methyl ethyl ketone Methyl isoamyl ketone Nitric acid (50%) Perchloroethylene Phenol Sulphuric acid Toluene Xylene TABLE 1 GeosyntheticsMagazine.com 25 needed properties like UV protection and crack resistance. While the base material may be suitable for the foreseen conditions, these antioxidants/plasticizers/ stabilizers can be subject to chemical attack or degradation, thereby leading to losses in the desired properties over time. In some cases, these additives may migrate to the surface of the material and become a contaminant. This is another aspect that introduces a variable into the effective life span of a liner. How long will the additive remain functional? If both the geomembrane base material and the additives sustaining the life of the geomembrane are not fully inert materials, two corrosion variables must be considered instead of one. One plus one does not equal two when combining an inert material with a chemically susceptible material. PVC-EIA Chemically attacked Chemically attacked Chemically attacked Chemically attacked Chemically resistant Chemically attacked Chemically attacked Chemically resistant Chemically attacked Chemically attacked Chemically attacked Chemically attacked Chemically attacked Chemically attacked Chemically attacked Chemically attacked HDPE Chemically resistant Chemically resistant Chemically resistant Chemically attacked Chemically attacked Chemically resistant Chemically resistant Chemically attacked Chemically resistant Chemically resistant Chemically attacked Chemically attacked Chemically resistant Chemically resistant Chemically attacked Chemically attacked PVDF Chemically resistant Chemically attacked Chemically attacked Chemically resistant Chemically resistant Chemically attacked Chemically resistant Chemically resistant Chemically attacked Chemically attacked Chemically resistant Chemically resistant Chemically resistant Chemically attacked Chemically resistant Chemically resistant PTFE Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant Chemically resistant FIGURE 2 Shop fabricated PTFE liner accordion folded and ready for shipment and rapid deployment at site.http://www.GeosyntheticsMagazine.com