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|Title:||Susceptibility of ABS, FEP, FRE, FRP, PTFE, and PVC well casing to degradation by chemicals|
|Authors:||U.S. Army Environmental Center.|
Ranney, Thomas A.
Parker, L. V. (Louise V.)
Acrylonitrile butadiene styrene (ABS)
Groundwater monitoring wells
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 95-1.|
Abstract: This study compares the chemical resistance of four less commonly used materials for casing groundwater monitoring wells: acrylonitrile butadiene styrene (ABS), fluorinated ethylene propylene (FEP), fiberglass-reinforced epoxy (FRE), and fiberglass-reinforced plastic (FRP), with two more commonly used casing materials: polyvinyl chloride (PVC) and polytetrafluoroethylene (PTFE). The six materials were exposed to 28 neat organic compounds (including one acid) and to extremely acidic and alkaline conditions for up to 112 days. This was done to simulate some of the most aggressive environments that monitoring well casings may be exposed to. The casings were observed for changes in weight and signs of physical degradation (swelling, softening, decrease in strength, deterioration, or dissolution). As expected, the two fluorinated polymers (FEP and PTFE) were the most inert materials tested. They were not degraded by any of the test chemicals, although samples exposed to a few organic chemicals did show a slight weight gain (~1%). Among the nonfluorinated products tested, FRE was the most inert. Three organic chemicals caused particles to flake from the FRE surface, followed by separation of the glass fibers, and two organic chemicals caused weight gains exceeding 10%. Also, highly acidic conditions (pH <1) degraded this material, and this may limit the use of this material in acidic environments. ABS was the most readily degraded material. By the end of the study, only the acid and alkaline solutions had little effect on ABS. FRP was more severely degraded by the organic chemicals than FRE was, but was less affected than PVC. Like FRE, FRP was also degraded under highly acidic conditions.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Special Report|
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