The external link that nano werk provided takes you to Evonik Industries where I could not find the claim of 700 celcius and above for Separion. The number I posted came from the Evonik Litarion website, I would be inclined to think that the person at nano werk made a tying error, but, what other non Evonik Litarion website specific articles do have that state 700 celcius and above?