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The purpose of this research was to make of activated carbon from rice husk be useful as filler. To inspect the conformity as filler, the activated carbon from rice husk was applied in the preparation of rubber mat compound, in the case carbon black N 330 was used as the standard of comparison. Activated carbon from rice husk was made by carbonization process at temperature of 450oC for one hour and activation process with NaCl 4% for 24 hours, followed by pyrolysis at temperature 500oC for one hour. Filler was milled and sieved by 400 mesh siefter. Rubber mat compound were prepared with various filler level of activated carbon from rice husk, carbon black N 330 either separately formulated or combination. The vulcanized rubber mat was then physically tested its tensile strength, elongation at break, hardness, an density. The research showed that the addition of filler by combining the activated carbon from rice husk and carbon black with ratio of 40:20 phr into the rubber compound could meet the physical properties requirements of rubber mat. Activated carbon from rice husk can be used as filler, but not as reinforcing filler.