Omnistab AN 565 is a non-staining multifunctional hindered phenolic antioxidant with a highly effective stabilization for a variety of elastomers including polybutadiene (BR), polyisoprene (IR) and emulsion styrene butadiene (SBR). It is also useful for the stabilization of hot melt adhesives (especially those derived from unsaturated elastomers) and rosin ester tackifier resins, EPDM, ABS, impact polystyrene, polyamides, and polyolefins. Omnitab AN 565 is highly effective at low concentrations, matching the performance of other stabilizers at higher levels. It can be used in a wide variety of applications. The effectiveness of this product used in unsaturated elastomers, prevents the gel formation, maintains excellent polymer color, and prevents molecular weight changes.