Thanks for the link cartex. Further up in this thread you stated...

Thanks for the link cartex.

Further up in this thread you stated "The one application were secondary synthetics works very well and natural flake does not is bi-polar plates...". This is the only reason why I posted my link (i.e: as a rebuttal to your point that natural flake does not work very well in bi polar plate usage).

However your link suggests that expanded graphite from natural flake is used in bipolar plates. Quoting from your link:

"Ballard’s Mark 900 series liquid-cooled fuel cell stack introduced in January 2000 was the first to use resin impregnated expanded graphite for on-road vehicles
• 2000-2006 Used in early generation automotive prototypes (Daimler-Chrysler NECAR Mercedez Benz A - Class, Ford Focus, Honda FCX, and bus programs (Daimler Chrysler Citaro)
• Introduced into fork lift applications in 2005 with General Hydrogen. > 13,000 Plug Power GenDrive® vehicles now in service
• Used in current generation FCveloCity ® modules for bus applications
• > 1,000,000 bipolar plates produced
• Have accumulated :–>10 million km of road service in bus and automotive applications
– Millions of hours of run time in fork lift applications"

It would appear the link you posted agrees with my point of view.

Cheers.