Why would natural rubber be better then synthetic rubber for this problem? Asbestos is natural and toxic as hell. Natural rubber currently has the property of

Why would natural rubber be better then synthetic rubber for this problem? Asbestos is natural and toxic as hell. Natural rubber currently has the property of being mostly inside trees not being ground up into a fine powder - but there's no obvious reason at scale it would be any better except in terms of "slightly less wear over time". Is it's chemistry fundamentally different?