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Topic: PTFE

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	Fuel cell membrane electrode assemblies with improved power outputs and poison resistance - Patent 6300000
		The Pt/skived PTFE was hot pressed against the membrane to bond the Pt evaporated layer to the membrane by the decal method.
		The electrocatalyst zone was coated at a deposition rate averaging 6.ANG./sec as measured with a vibrating crystal microbalance to the specified target loading, with a magnetron power ranging of 250-500 W, 490-570 V dc bias, and 450-900 mA Ar.sup.+ flux.
		Electrode elements such as ELAT gas diffusion media and 6 mil skived PTFE sheets were placed in a vacuum chamber.(1.5 m diameter, 2 m long) which was pumped down to ca.
	www.freepatentsonline.com /6300000.html (18806 words)

	Fluorotherm - Properties
		Melt Temperature: PTFE - Does not melt, softens at 625 deg F, FEP - 500 deg F
		PTFE, being a homopolymer, has the best thermal and best chemical resistance compared to copolymers.
		In general PTFE has a tensile strength 15% to 20% lower than FEP; however, this difference may narrow at higher operating temperatures due to the higher sensitivity of FEP to increase to temperature.
	www.fluorotherm.com /properties.htm (326 words)

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