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Design and Optimization of a Permeation Testing System for Polymer Coatings



Adrian E. Verwolf


Measurements of liquid permeation through freestanding Parylene C membranes were made using a high- performance testing system, which demonstrated fast response (≤ 30 seconds) to changing concentrations in the sweep gas stream and detectability of less than 20 mPa of water vapor. The bulk of the maximum measured transport rates through Parylene C were attained within 30 minutes of injecting water into the feed side of the dry test cell. The characteristic time-transport rate curves were similar to those produced via water vapor fed directly into the sweep-gas stream from a novel in situ water vapor diffusion reference membrane. Average values of diffusivity D measured at 37 °C ranged from 8.1e-9 to 8.8e-9 cm2/s. The implications of experimental results are discussed with respect to transient permeation for medical device coating applications specifically and metrology generally.
Proceedings Title
Materials and Processes for Medical Devices 2011
Conference Dates
August 8-10, 2011
Conference Location
Minneapolis, MN


permeation, Parylene C, medical devices, polymer coatings


Verwolf, A. (2011), Design and Optimization of a Permeation Testing System for Polymer Coatings, Materials and Processes for Medical Devices 2011, Minneapolis, MN (Accessed April 23, 2024)
Created August 8, 2011, Updated February 19, 2017