The present invention lies in a flame-retardant rubber composition
comprising, as essential components, a synthetic rubber (a component A),
a flame-retardant (a component B), sulfur (a component C) and a
polyfunctional monomer la component D), wherein an amount of the
component B is 10 to 200 parts by masse an amount of the component C is
0.1 to 15 parts by mass and an amount of the component D is 3 to 30 parts
by mass, all relative to 100 parts by mass of the component A. It is a
technical task of the present invention to provide a flame-retardant
rubber composition which has excellent flame retardancy and can give a
fully satisfactory mechanical strength (particularly, tensile strength at
break) even when subjected to steam cure generally regarded to be
difficult to impart a strength.