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The popularity of coffee consumption has increased steadily in these years, so the amount of coffee grounds per year is grown. However, the coffee contain an antioxidant, hence the coffee grounds in part. It has been used as components in cosmetics are also grounds the physical characteristics that are highly porous can absorb moisture. The composition of the element potassium (K), calcium, Ca) and magnesium (Mg). The requirements to the application of the coffee grounds for the needing to increase the use of natural rubber, so we have an interest in that project research. "A preliminary study on the application of coffee grounds in latex" NR - coffee grounds composite as an alternative to adding value to natural rubber as well as applications that waste coffee grounds to benefit even more. The result shows that flexible rubber particles are the coffee grounds, but not on the stretch elastic properties make it worse. When the rubber, crushed the particles are smaller when coffee grounds make great treasure, not grind.