Biodiesel is a renewable alternative energy that can reduce the quantity of diesel oil consumption from non-renewable oil. The purpose of this research is biodisel characteristic of rubber seed oil by using zeolite catalyst by Gas chromatography-mass spectrometry method. Stages in this research are extraction process, esteriļ¬cation and transesteriļ¬cation by using natural zeolit as catalyst. The result of analysis that has been done on the use of 1% catalyst yield 96,49% methyl ester with glycerol content 0,35%, catalyst 2,5% yield 94,69% methyl ester with glycerol content 0,67%, and at catalyst usage 3.5% yielded 97.50% methyl esters with a 0.08% glycerol content. When compared to SNI-7182-2006 quality standard on catalyst usage 3.5% of raw materials of methyl ester and glycerol content as well as testing the quality characteristics of biodiesel does not meet the standards
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