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PREDICTING THE BARRIER EFFECTIVENESS OF FLUOROPOLYMER FILM-BASED PROTECTIVE CLOTHING MATERIALS
Citation:
Goydan, R., J. Powell, R. Reid, B. Billing, AND E. Renard. PREDICTING THE BARRIER EFFECTIVENESS OF FLUOROPOLYMER FILM-BASED PROTECTIVE CLOTHING MATERIALS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-89/266.
Description:
Emergency spill response and hazardous waste cleanup activities often require protective clothing that is an effective barrier to a wide range of chemicals and chemical mixtures. everal clothing products are now available that are based on high barrier films and laminates. xamples are the fluoropolymer film-based Challenge 5100 and Challenge 5200 totally encapsulating ensembles. n this study, the results of over 300 permeation tests of the Challenge materials were evaluated. hen permeation occurred, it was shown to follow a simple Fickian diffusion mechanism. odel or a rule system that enables the explanation/prediction as to whether permeation will be detected within 3 hours at 250 was developed. he model predicts permeation based on the structure and size of chemical of interest. n the case of mixtures, the following characteristic was observed: If a chemical permeates the Challenge material as a neat chemical, then it will permeate from a mixture with its rate dependent on its concentration in the mixture. onversely, if a chemical does not permeate in the neat form it will not permeate from a mixture.