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Chemiluminescence, size exclusion chromatography, differential scanning calorimetry, thermogravimetry, and Fourier transform infrared spectroscopy were used to assess differences in oxidation rate between two different pro‐oxidant systems in degradable low‐density polyethylene. The pro‐oxidant formulation used consisted of manganese stearate and natural rubber or manganese stearate and a synthetic, styrene‐butadiene copolymer rubber. The low‐density polyethylene containing the pro‐oxidant with natural rubber showed the highest degradation rate. Chemiluminescence and thermogravimetry were found to be the most effective techniques for establishing the differences between different pro‐oxidant systems. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 2309–2316, 2001