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The recertification of the polystyrene standard reference material, SRM 706a, is described. The Mw of SRM 706a by light scattering was determined to be 2.85 x 10 5 g/mol with a sample standard deviation of 0.019 x 10 g/mol. A combined expanded uncertainty of 0.23 x 1 0 5 g/mol is estimated for this determination. The M* obtained for this recertification agrees with the of 2.87 x 10 g/mol obtained from recent light scattering measurements on SRM 706. The IV^ obtained for SRM 706a is also in excellent agreement with the M* obtained by ultracentrifugation in 1967 of 2.88 x 10 g/mol on SRM 706. Bottle-to-bottle variability was found to be below detectable levels for SRM 706a in a size exclusion chromatography study.

Recertification of the SRM 706a, a polystyrene