Accession Number : ADA255453


Title :   Softening of Rigid Polyvinyl Chloride by High Concentrations of Aqueous Solutions of Methylene Chloride


Descriptive Note : Special rept.


Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH


Personal Author(s) : Parker, Louise V ; Ranney, Thomas A ; Taylor, Susan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255453.pdf


Report Date : May 1992


Pagination or Media Count : 45


Abstract : In this experiment, small pieces of rigid PVC pipe were exposed to high aqueous concentrations of methylene chloride corresponding to 0.2, 0.4, 0. 6, 0.8 and 1.0 activity solutions. Samples were exposed to the test solutions for 4, 8, 15, 22 and 33 days. Samples exposed to the highest activity solution (1.0) softened within the first 4 days, while samples exposed to the 0.8 activity solution took 22 days to soften. Samples exposed to the lowest activity solution (0.2) showed no signs of softening, while the results for the samples exposed to the 0.4 and 0.6 activity solutions showed some slight changes, indicating some softening. These results reveal that concentrations of methylene chloride below 3340 mg/L (0.2 activity) will not cause softening or serious swelling of rigid PVC.


Descriptors :   *CHLORIDES , *METHYLENES , *RIGIDITY , *POLYVINYL CHLORIDE , *SOFTENING , TEST AND EVALUATION , MONITORING , ORGANIC SOLVENTS , SORPTION , POLLUTION , SOLVENTS , PIPES , GROUND WATER


Subject Categories : Organic Chemistry
      Hydrology, Limnology and Potamology
      Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE