In this study we reported synergic activity of a novel secondary accelerator N-Benzylimine aminothioformamide (BIAT) along with tetramethylthiuram disulfide (TMTD) in improving cure and mechanical properties of gum and filled mixes of Styrene-Butadiene Rubber (SBR). The feasibility of application of BIAT in sulfur vulcanization of an ideal blend of SBR and natural rubber (NR) has also been investigated. The mechanical properties like tensile strength, tear resistance, hardness, compression set, and abrasion loss were measured. Swelling values were also determined as a measure of crosslink densities of the vulcanizates. The binary accelerator system BIAT-TMTD was found very effective in improving cure properties of the mixes of pure SBR and a 50/50 blend of SBR and NR. There was also found simultaneous improvement in mechanical properties of vulcanizates of both pure and blend. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 2257-2263, 2011