Most (quadruped) dragons are depicted as having two wings sprouting from their back, consisting of a limb structure draped with a leathery membrane as the way to create lift and fly, somewhat resembling bat wings.
I'm looking for a material to replace the membrane with, with some better qualities than a thin, fragile piece of skin. I'm excluding feathers and somewhat stiffer wings like pterosaurs seem to have had (according to this question: Bats With Pterosaur Wings).
The properties I'm looking for:
- Tough/hard, tear-resistant material
- Capable of creating and sustaining lift
- (Largely) chemically inert
To be clear, they fly by flapping the wings / soaring on currents, as birds do.The dragons in this case are small (somewhat bigger than a big dog / size of a medium-sized pony). They do not weigh much to be able to fly (how much is still open for debate).
Does such a material exist? Would it be plausible to appear naturally in a creature? What speed would a dragon as depicted be able to achieve with wings consisting of this material?