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TR 1999/044: Comparison of West's 1888 Gray & Natural Rubber-Free 4588/40 Gray

This report compares two formulations for: % Ash, Infrared Analysis, Moisture Vapor Transmission, Oxygen Transmission, Specific Gravity, and UV testing.
This report summarizes some chemical and functional characteristics of a natural rubber-free formulation and provides data on standard serum stoppers.

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