Clarifying the nomenclature of Elvaloy-based geomembranes
A KEE molecular weight of 100,000 grams/mole is 250 times higher than currently required (400 grams/mole) by the FGI 1117 specification for PVC geomembranes. KEE is a solid-phase (polymeric) plasticizer, not liquid, which helps explain its high molecular weight and resistance to migration.
PVC Geomembranes for Environmental Containment | Layfield
Flexible Polyvinyl Chloride films (usually called PVC) have been used for geomembrane applications for over 60 years. PVC films are blends of rigid PVC (such as in PVC pipe) with softening agents called plasticizers.
PVC geomembrane plasticizer technology
PVC geomembrane plasticizer technology Technology of Plasticizers EXTRACT FROM: "THE TECHNOLOGY OF PLASTICIZERS" BY J. KERN SEARS AND JOSEPH R. DARBY CHAPTER ON "PERMANENCE OF PLASTICIZED PVC"from the plasticizers occupying more of the surface area at higher concentrations.
PVC fabricated geomembrane polymeric plasticizers EPI - The
Blending plasticizers such as this is a popular way of getting the best of both worlds for cost and performance. Using the polymeric plasticizer, we have greatly reduced 50% modulus and elongation loss and slightly reduced tensile increase values. Table 2. Air Oven Volatility Resistance of Select Plasticizers in PVC.
GRI White Paper#6 - Geosynthetic Institute
Table 1 for the most common types of geomembranes and their approximate formulations. Table 1 - Types of commonly used geomembranes and their approximate formulations (based on weight percentage) Type Resin Plasticizer Fillers Carbon Black Additives HDPE 95-98 0 0 2-3 0.25-1 LLDPE 94-96 0 0 2-3 0.25-3 fPP 85-98 0 0-13 2-4 0.25-2
- What are PVC-P waterproofing geomembranes?
- Formualtion PVC-P waterproofing geomembranes are composed of 30–40% PVC resin and other additives ( Koerner, 2012), mainly plasticizers. Plasticizers are a group of more than 1000 different polymers used to change the behaviour of PVC from a rigid material to a semi-rigid or flexible one.
- What is PVC geomembrane?
- PVC geomembrane is a highly flexible thermoplastic waterproofing geomembrane manufactured from a mixture of vinyl compounds, plasticizers, and stabilizers. They are your answer if you need to cover your subgrade fast.
- Are PVC-P geomembranes degraded in underground application conditions?
- To analyse the long-term degradation of PVC-P geomembranes in underground application conditions, in this study, a specifically designed accelerated ageing device has been used for the tests. Furthermore, plasticizer absorption tests have been used to estimate the dependence of plasticizer loss on temperature and plasticizer content.
- How much plasticizer is in a geomembrane?
- Typically, the plasticizer content in geomembranes ranges from 25 to 35% in weight. Fillers (e.g. CaCO 3) added to the PVC resin may also account for 20–30% of the weight of the geomembrane. Fillers are used to reduce the price, but also to enhance the abrasion resistance and flame-retarding properties.
- Does plasticizer loss affect geomembranes in underground applications?
- In the hypothesis that plasticizer loss is the only degradation process relevant to geomembranes in underground applications, the loss of plasticizer can be evaluated through the loss of weight of the specimens. Accordingly, all the specimens were cleaned, dried in the desiccator for 72 h and weighed before testing.
- How does a PVC-P geomembrane aging device work?
- The device accelerates the ageing of the geomembrane in conditions similar to those in underground applications. Two commercial PVC-P geomembranes are tested, and mechanical tests are performed on the aged geomembranes to evaluate the effect of ageing on the properties of the material.
