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Master curves for polystyrene, polyraethyl acrylate and polymethyl methacrylate in stress relaxation are reported. The method used to obtain a wide range In modulus is to com-bine torslonal creep data for high modulus regions with direct stress relaxation data for low moduli. The composite curves obtained are compared with existing literature data. The master curve for polystyrene obtained by a ball indenta-tion method is also reported. Characteristic viscoelastic parameters derived from the data are tabulated