nylon is said to be the strongest fibre..!!

Graphene is a sheet of Carbon atoms, or one layer of Graphite ("lead" in a pencil). A graphene filter is a filter made of graphene.

Graphene is pretty amazing. An adequate description of the properties is rather long. There is a link below to the properties section of an article on graphene.

Graphene is formed by peeling extremely thin layers of graphite off of a larger piece, in the original paper published on graphene it was done using tape.

Graphene is a very thin layer of graphite. It is so thin, it is so close to being invisible!