Abstract: The coagulating and antifungal properties of Eucalyptus globulus wood vinegars (raw and tar-extracted types) in the production process of Hevea brasiliensis Natural Rubber (NR) sheets were investigated and compared with those of formic and acetic acids. It was found that plasticity retention index, Mooney viscosity, curing times (t90) and mechanical properties of NR coagulated by wood vinegars were similar to those using acetic acid and better than using formic acid. The antifungal efficiency of wood vinegars, acetic acid and formic acid was determined from a fungi growth area on NR sheet surfaces. The antifungal efficiency of the coagulants was found in the following order: raw wood vinegar > tar-extracted wood vinegar > acetic acid > formic acid. The antifungal efficiency of the wood vinegars was confirmed through the inhibitory growth of the main fungus, Penicillium griseofulvum, on potato dextrose agar.