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. 2015 Dec 4;15(12):30693–30703. doi: 10.3390/s151229811

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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PTFE samples under different magnification. (a) PTFE reference with magnification of × 1000; and (b) PTFE reference with magnification of × 2500 times; (c) PTFE sample immersed in oil for 90 days, with magnification of × 1000; and (d) PTFE sample immersed in oil for 90 days, with magnification of × 2500 times.