asbestos is a very distinct material, and will not be bonded in rubber. or, at least, it will not be woven sheet but will be chopped in some way to ensure the stuff is actually where its needed, on the friction surfaces. if its hard, and i mean hard, my moneys on it being asbestos. otherwise, no. if youre really worried, burn one. cus what doesnt asbestos do? no matter if you need a blowtorch, asbestos will not melt!
hear hear, it is not dangerous as long as its not released as fine particles into the air, then into your lungs. talcum powder contains asbestos, and its the same material as mica.
(what happens when the alcohol evaporates away? use some 2 stroke mix so at least the stuff stays bonded up in the oil afterwards...)
the rubber bonded fabric filled ones, appear to be stamped from the same scrap as the rag joint rubbers on the rear sprocket. that appears to be sidewalls of tyres. or any other suitable thickness scrap. like truck mudflaps.
the orange ones, never found them.
so far, as long as alls adjusted, never had an issue with clutch slipping.
