NOVELTY - Solvent-less liquid ethylene propylene diene rubber compound or solvent-less liquid ethylene propylene rubber compound comprises: (a) 20-60 wt.% of a liquid ethylene propylene diene rubber consisting of a terpolymer of ethylene monomer, propylene monomer and diene monomer; (b) 1-15 wt.% of a solid ethylene propylene diene dissolved in a plasticizing oil; (c) 5-30 wt.% of a plasticizer; (d) 5-30 wt.% of a filler system; and (e) a crosslinking agent, forming the solvent-less liquid ethylene propylene diene rubber compound.    USE - The solvent-less liquid ethylene propylene diene rubber compound is useful: in liquid injection molding (claimed), fuel cells, home generators; to form a hydrogen permeable layer that is not permeable to oxidants or fuel; and for manufacturing the solvent-less liquid rubber compound comprising gaskets, o-rings, molded button covers and shock dampening parts.    ADVANTAGE - The solvent-less liquid ethylene propylene diene rubber compound: contains substantially no solvent; is environmentally safe; and have no handling issues associated with solvents, high extendibility and enhanced tensile and elongation properties; and resists ozone degradation.    DETAILED DESCRIPTION - Solvent-less liquid ethylene propylene diene rubber compound or solvent-less liquid ethylene propylene rubber compound, comprises: (a) 20-60 wt.% of a liquid ethylene propylene diene rubber consisting of a terpolymer of ethylene monomer, propylene monomer and optionally diene monomer; (b) 1-15 wt.% of a solid ethylene propylene diene dissolved in a plasticizing oil; (c) 5-30 wt.% of a plasticizer; (d) 5-30 wt.% of a filler system; and (e) a crosslinking agent, forming the solvent-less liquid ethylene propylene diene rubber compound or solvent-less liquid ethylene propylene rubber compound, where the solvent-less liquid ethylene propylene diene rubber compound or solvent-less liquid ethylene propylene rubber compound has a viscosity of 150000-750000 centipoises at 23 degrees C; the solvent-less liquid ethylene propylene diene rubber compound contains substantially no solvent; and the solvent-less liquid ethylene propylene diene rubber compound is liquid injection moldable. An INDEPENDENT CLAIM is included for making a finished part from a solvent-less liquid ethylene propylene diene rubber compound or a solvent-less liquid ethylene propylene rubber compound using liquid injection molding equipment, comprises: (aa) mixing (i) 20-60 wt.% of the liquid ethylene propylene diene rubber, or 20-60 wt.% of the liquid ethylene propylene rubber, (ii) 1-15 wt.% of a solid ethylene propylene diene rubber dissolved in a plasticizing oil, (iii) 5-30 wt.% of plasticizer, (iv) 5-30 wt.% of a filler system, and (v) a crosslinking agent, forming a uniform mixture having a viscosity of 150000-750000 centipoises at 23 degrees C, (bb) molding the uniform mixture at 120-200 degrees C using the liquid injection molding equipment, and causing crosslinking (partially crosslinking or fully crosslinking) of polymers within the uniform mixture, forming the finished part, and (cc) removing the finished part from the liquid injecting molding equipment, where the finish part has a tensile strength of 300-1100 pounds per square inch.